diff --git a/doc/mainpage.dox b/doc/mainpage.dox
index 7cd5015..2192aa4 100644
--- a/doc/mainpage.dox
+++ b/doc/mainpage.dox
@@ -15,7 +15,7 @@
  * <a class="el" href="https://en.cppreference.com/w/cpp/container/map">std::map</a>
  * to speed up the access.
  *
- * You can obtain handlers by calling LMDBAL::Base::addStorage(const std::string&) or LMDBAL::Base::addCache(const std::string& name).
+ * You can obtain handlers by calling LMDBAL::Base::addStorage(const std::string&, bool) or LMDBAL::Base::addCache(const std::string& name).
  * Note that the handlers still belong to the LMDBAL::Base and it's his responsibility to destroy them.
  * You are not obliged to save those handlers,
  * you can obtain them at any time later using methods LMDBAL::Base::getStorage(const std::string&) or LMDBAL::Base::getCache(const std::string&)
diff --git a/src/base.h b/src/base.h
index fd5ba18..8b21c77 100644
--- a/src/base.h
+++ b/src/base.h
@@ -46,8 +46,8 @@ class Storage;
 template <class K, class V>
 class Cache;
 
-typedef MDB_txn* TransactionID;                         /**<I'm going to use transaction pointers as transaction IDs*/
-typedef uint32_t SizeType;                              /**<All LMDBAL sizes are uint32_t*/
+typedef MDB_txn* TransactionID;                         /**<\brief I'm going to use transaction pointers as transaction IDs*/
+typedef uint32_t SizeType;                              /**<\brief All LMDBAL sizes are uint32_t*/
 
 class Base {
     friend class iStorage;
@@ -82,8 +82,8 @@ public:
     LMDBAL::Cache<K, V>* getCache(const std::string& storageName);
 
 private:
-    typedef std::map<std::string, LMDBAL::iStorage*> Storages;  /**<Storage and Cache pointers are saved in the std::map*/
-    typedef std::set<TransactionID> Transactions;               /**<Piblic transaction IDs are saved in the std::set*/
+    typedef std::map<std::string, LMDBAL::iStorage*> Storages;  /**<\brief Storage and Cache pointers are saved in the std::map*/
+    typedef std::set<TransactionID> Transactions;               /**<\brief Piblic transaction IDs are saved in the std::set*/
 
     TransactionID beginReadOnlyTransaction(const std::string& storageName) const;
     TransactionID beginTransaction(const std::string& storageName) const;
diff --git a/src/storage.cpp b/src/storage.cpp
index 2f50cd4..b96ad4c 100644
--- a/src/storage.cpp
+++ b/src/storage.cpp
@@ -23,6 +23,8 @@
 /**
  * \class LMDBAL::iStorage
  *
+ * \brief Storage interface
+ *
  * This is a interface-like class, it's designed to be an inner database interface to
  * be used as a polymorphic entity, and provide protected interaction with the database
  * from the heirs code
diff --git a/src/storage.hpp b/src/storage.hpp
index 8a8ef31..b3ef621 100644
--- a/src/storage.hpp
+++ b/src/storage.hpp
@@ -31,7 +31,7 @@
  * \tparam K type of the keys of the storage
  * \tparam V type of the values of the storage
  *
- * You can receive an instance of this class calling LMDBAL::Base::addStorage(const std::string&)
+ * You can receive an instance of this class calling LMDBAL::Base::addStorage(const std::string&, bool)
  * if the database is yet closed and you're defining the storages you're going to need.
  * Or you can call LMDBAL::Base::getStorage(const std::string&) if you didn't save a pointer to the storage at first
  *
@@ -501,6 +501,9 @@ bool LMDBAL::Storage<K, V>::checkRecord(const K& key, TransactionID txn) const {
  *
  * Basically just reads all database in an std::map, usefull when you store small storages
  *
+ * In case storage supports duplicates <b>only what lmdb considered to be lowest value</b>
+ * (see LMDBAL::Storage::getRecord() description) is returned in the resulting map
+ *
  * \exception LMDBAL::Closed    thrown if the database was not opened
  * \exception LMDBAL::Unknown   thrown if something unexpected happend within lmdb
  */
@@ -518,6 +521,9 @@ std::map<K, V> LMDBAL::Storage<K, V>::readAll() const {
  *
  * Basically just reads all database in an std::map, usefull when you store small storages
  *
+ * In case storage supports duplicates <b>only what lmdb considered to be lowest value</b>
+ * (see LMDBAL::Storage::getRecord() description) is returned in the resulting map
+ *
  * \param[out] result   a map that is going to contain all data
  *
  * \exception LMDBAL::Closed    thrown if the database was not opened
@@ -545,6 +551,9 @@ void LMDBAL::Storage<K, V>::readAll(std::map<K, V>& result) const {
  * You can obtain LMDBAL::TransactionID calling LMDBAL::Base::beginReadOnlyTransaction() or LMDBAL::Base::beginTransaction().
  * If you just want to read data you should prefer LMDBAL::Base::beginReadOnlyTransaction().
  *
+ * In case storage supports duplicates <b>only what lmdb considered to be lowest value</b>
+ * (see LMDBAL::Storage::getRecord() description) is returned in the resulting map
+ *
  * \param[in] txn      transaction ID, can be read only transaction
  *
  * \exception LMDBAL::Closed    thrown if the database was not opened
@@ -566,6 +575,9 @@ std::map<K, V> LMDBAL::Storage<K, V>::readAll(TransactionID txn) const {
  * You can obtain LMDBAL::TransactionID calling LMDBAL::Base::beginReadOnlyTransaction() or LMDBAL::Base::beginTransaction().
  * If you just want to read data you should prefer LMDBAL::Base::beginReadOnlyTransaction().
  *
+ * In case storage supports duplicates <b>only what lmdb considered to be lowest value</b>
+ * (see LMDBAL::Storage::getRecord() description) is returned in the resulting map
+ *
  * \param[out] result   a map that is going to contain all data
  * \param[in] txn      transaction ID, can be read only transaction
  *
@@ -587,8 +599,10 @@ void LMDBAL::Storage<K, V>::readAll(std::map<K, V>& result, TransactionID txn) c
     while (rc == MDB_SUCCESS) {
         K key;
         keySerializer.deserialize(lmdbKey, key);
-        V& value = result[key];
-        valueSerializer.deserialize(lmdbData, value);
+        std::pair<typename std::map<K, V>::iterator, bool> probe = result.emplace(key, V{});
+        if (probe.second)                                               //I do this to avoid overwrites in case duplicates are enabled
+            valueSerializer.deserialize(lmdbData, probe.first->second);
+
         rc = mdb_cursor_get(cursor, &lmdbKey, &lmdbData, MDB_NEXT);
     }
     mdb_cursor_close(cursor);
diff --git a/test/duplicates.cpp b/test/duplicates.cpp
index d84ba2b..56b63fd 100644
--- a/test/duplicates.cpp
+++ b/test/duplicates.cpp
@@ -1,9 +1,12 @@
 #include <gtest/gtest.h>
 
 #include <limits>
+#include <map>
+#include <set>
 
 #include "base.h"
 #include "storage.h"
+#include "cursor.h"
 
 class DuplicatesTest : public ::testing::Test {
 protected:
@@ -326,3 +329,139 @@ TEST_F(DuplicatesTest, Changing) {
     EXPECT_EQ(tu4->getRecord(852), 213.85);
     EXPECT_THROW(tu4->changeRecord(852, 46324.1135), LMDBAL::Exist);
 }
+
+TEST_F(DuplicatesTest, GettingAllRecords) {
+    LMDBAL::TransactionID txn = db->beginReadOnlyTransaction();
+    bool cycle;
+    LMDBAL::SizeType iterations;
+
+    std::map<int16_t, uint16_t> m1;
+    std::set<int16_t> k1;
+    LMDBAL::Cursor<int16_t, uint16_t>* c1 = tu1->createCursor();
+    tu1->readAll(m1, txn);
+    c1->open(txn);
+
+    cycle = false;
+    iterations = 0;
+    do {
+        try {
+            std::pair<int16_t, uint16_t> pair = c1->next();
+            cycle = true;
+            std::pair<std::set<int16_t>::const_iterator, bool> probe = k1.insert(pair.first);
+            if (probe.second) {
+                uint16_t valueAll = m1.at(pair.first);
+                uint16_t valueGet;
+                EXPECT_NO_THROW(tu1->getRecord(pair.first, valueGet, txn));
+                EXPECT_EQ(valueAll, valueGet);
+            }
+            ++iterations;
+        } catch (const LMDBAL::NotFound& e) {
+            cycle = false;
+        }
+    } while (cycle);
+    tu1->destroyCursor(c1);
+
+    EXPECT_EQ(iterations, tu1->count(txn));
+    EXPECT_EQ(k1.size(), m1.size());
+    EXPECT_NE(iterations, 0);
+    EXPECT_NE(k1.size(), 0);
+
+
+    std::map<std::string, int8_t> m2;
+    std::set<std::string> k2;
+    LMDBAL::Cursor<std::string, int8_t>* c2 = tu2->createCursor();
+    tu2->readAll(m2, txn);
+    c2->open(txn);
+
+    cycle = false;
+    iterations = 0;
+    do {
+        try {
+            std::pair<std::string, int8_t> pair = c2->next();
+            cycle = true;
+            std::pair<std::set<std::string>::const_iterator, bool> probe = k2.insert(pair.first);
+            if (probe.second) {
+                int8_t valueAll = m2.at(pair.first);
+                int8_t valueGet;
+                EXPECT_NO_THROW(tu2->getRecord(pair.first, valueGet, txn));
+                EXPECT_EQ(valueAll, valueGet);
+            }
+            ++iterations;
+        } catch (const LMDBAL::NotFound& e) {
+            cycle = false;
+        }
+    } while (cycle);
+    tu2->destroyCursor(c2);
+
+    EXPECT_EQ(iterations, tu2->count(txn));
+    EXPECT_EQ(k2.size(), m2.size());
+    EXPECT_NE(iterations, 0);
+    EXPECT_NE(k2.size(), 0);
+
+
+    std::map<float, float> m3;
+    std::set<float> k3;
+    LMDBAL::Cursor<float, float>* c3 = tu3->createCursor();
+    tu3->readAll(m3, txn);
+    c3->open(txn);
+
+    cycle = false;
+    iterations = 0;
+    do {
+        try {
+            std::pair<float, float> pair = c3->next();
+            cycle = true;
+            std::pair<std::set<float>::const_iterator, bool> probe = k3.insert(pair.first);
+            if (probe.second) {
+                float valueAll = m3.at(pair.first);
+                float valueGet;
+                EXPECT_NO_THROW(tu3->getRecord(pair.first, valueGet, txn));
+                EXPECT_EQ(valueAll, valueGet);
+            }
+            ++iterations;
+        } catch (const LMDBAL::NotFound& e) {
+            cycle = false;
+        }
+    } while (cycle);
+    tu3->destroyCursor(c3);
+
+    EXPECT_EQ(iterations, tu3->count(txn));
+    EXPECT_EQ(k3.size(), m3.size());
+    EXPECT_NE(iterations, 0);
+    EXPECT_NE(k3.size(), 0);
+
+
+    std::map<uint16_t, double> m4;
+    std::set<uint16_t> k4;
+    LMDBAL::Cursor<uint16_t, double>* c4 = tu4->createCursor();
+    tu4->readAll(m4, txn);
+    c4->open(txn);
+
+    cycle = false;
+    iterations = 0;
+    do {
+        try {
+            std::pair<uint16_t, double> pair = c4->next();
+            cycle = true;
+            std::pair<std::set<uint16_t>::const_iterator, bool> probe = k4.insert(pair.first);
+            if (probe.second) {
+                double valueAll = m4.at(pair.first);
+                double valueGet;
+                EXPECT_NO_THROW(tu4->getRecord(pair.first, valueGet, txn));
+                EXPECT_EQ(valueAll, valueGet);
+            }
+            ++iterations;
+        } catch (const LMDBAL::NotFound& e) {
+            cycle = false;
+        }
+    } while (cycle);
+    tu4->destroyCursor(c4);
+
+    EXPECT_EQ(iterations, tu4->count(txn));
+    EXPECT_EQ(k4.size(), m4.size());
+    EXPECT_NE(iterations, 0);
+    EXPECT_NE(k4.size(), 0);
+
+
+    db->abortTransaction(txn);
+}