The East Prussian State Museum (OL) is the central collection point for cultural heritage objects from East Prussia and the Baltic States, but its library also houses over 15,000 relevant titles relating to the area.
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On the basis of its extensive collections, the East Prussian state museum (OL) preserves, researches and communicates the cultural heritage, history and landscape of East Prussia and the Baltic States, with a focus on the cultural history of the Baltic Germans. Objects from the fields of history, cultural history and natural history are displayed in a number of exhibition areas. One focal point of the collection is art and cultural historical objects from the above-mentioned regions. The OL exhibits precious gold and amber works, but also works of art from the Königsberg Academy of Art and the artists' colony in 
Nida

Nida is a small town on the Lithuanian Baltic coast. The city is in the west of the country directly on the border with the Russian oblast Kaliningrad. It is inhabited by just under 2,400 people and is the most western city in Lithuania.

. The museum has several thousand paintings and graphic artworks. In addition, the exhibition also deals with the eventful history of the region up until its decline. The collection includes classical cultural-historical pieces and also some archival pieces from the Middle Ages to the present. The 20th century focal points are, in particular, the two world wars, the crimes of National Socialism and the subsequent flight and expulsion of almost the entire German population, as well as their integration in post-war Germany. A separate section presents the history of the Baltic Germans in their historical settlement areas of 
Livonia
deu. Livland, est. Liivimaa, lav. Livonija, dan. Lyffland, swe. Livland, eng. Livland, deu. Vidzeme, lat. Livonia, rus. Lifliandiia, rus. Lifljandija, rus. Liflândiâ, rus. Лифляндия, rus. Livonija, rus. Livoniâ, rus. Ливония, rus. Vidzeme, rus. Видземе, pol. Liwlandia, lat. Terra Mariana, rus. Livoniia, rus. Livonya, rus. Liwonija, deu. Eifland, deu. Liefland, dan. Livland

Livonia (Livonija in Latvian, Liivimaa in Estonian) is a historical landscape in the Baltic States. It comprises the southern part of present-day Estonia and the part of present-day Latvia north of the Daugava River. The landscape was named after the Livonians, a population group that hardly exists today.

Historically, the name Livonia can refer to other, different contexts. The governorate of the same name, which was one of the three Baltic Sea governorates of the Russian Empire, is particularly influential for today's understanding of the historical region. It existed from the beginning of the 18th century until 1918 and its capital was Riga, located at the mouth of the Duna.

Livonia had previously given its name to other states and confederations, most notably the Livonian Confederation, which had existed since the High Middle Ages. The Livonian part of the Teutonic Order as well as regional ecclesiastical states belonged to the confederation. The confederation also included large parts of the present-day states of Latvia and Estonia. After the dissolution of the confederation and the Teutonic Order state in the 16th century, sovereignty changed several times. Without the southern and northern areas, Livonia initially came under Polish-Lithuanian rule, later also under Swedish suzerainty, before coming under Russian rule in the course of the Great Northern War (1700-1721). Until the beginning of the 20th century, the central role of the landowning German-speaking nobility was particularly influential in the internal social organization of the rural area.

Courland
deu. Kurland, lav. Kurzeme, rus. Kurljandja, rus. Курляндия, lat. Curonia, lat. Couronia, swe. Kurland, dan. Kurland, lat. Curlandia, pol. Kurlandia, rus. Kuronija, rus. Kuroniâ, rus. Курония, rus. Kurzeme, rus. Курземе, rus. Kurlândiâ, rus. Kurliandii︠a︡

Kurland is a historical landscape in present-day Latvia. It extends between the Baltic Sea and the Gulf of Riga, the Daugava River in the northeast and Lithuania in the south. Its name is derived from the Baltic Curonians, who lived here alongside the Ugro-Finnish Livonians. The largest cities in Kurland include Liepāja, Jelgava and Ventspils.

Today's understanding of the region is partly shaped by the Russian Baltic Sea Governorate of Courland, which existed from 1795 and formally until 1918. This actually included the smaller regions of Semigallia and Upper Latvia, which formed the central and eastern parts of the governorate. Today, they are often included when Courland is mentioned in a historical context. In the High Middle Ages, the influences of the Ugro-Finnish and Baltic peoples on the one hand and the Vikings on the other intersected here. In the Late Middle Ages and Early Modern Period, the region was also under the rule of Sweden, Denmark and, in particular, the Teutonic Order. Due to pressure from Russia and Sweden, the Order eventually withdrew from the area. Smaller parts of Courland were subsequently incorporated into Poland-Lithuania. The largest part remained a fiefdom of Poland-Lithuania until 1795 as the Duchy of Courland and Semigallia. Although Russian influence gradually increased, Courland did not become part of the Russian Empire until the Third Partition of Poland-Lithuania in 1795 – significantly later than the other two Baltic Sea provinces of Estonia and Livonia, which had already come under Russian rule during the Great Northern War (1700–1721).

, and 
Estland
deu. Estland, eng. Eestimaa, est. Eestimaa, lat. Hestonia, swe. Aistland, deu. Iste, lat. Aisti, lat. Aesti, dan. Estland, eng. Esthonia, lat. Estia, lat. Hestia, swe. Eistland, swe. Estlatum, swe. Estland, deu. Esthland, rus. Estljandija, rus. Ėstljandija, rus. Èstlândiâ, rus. Эстляндия, deu. Aestii

Estonia is a historical landscape in north-eastern Europe which comprises the northern part of the present-day Estonian state. The region is largely congruent with the same-named Baltic governorate in the Russian Empire which existed until 1918 and was one of three Baltic governorates alongside Livonia and Courland. In the High and Late Middle Ages and in the early modern period, parts of the region were also under the rule of Finnish princes, the Rus, Sweden, Denmark and the Teutonic Order. It was not until the Great Northern War (1700-1721) that Estonia came under Russian rule. Its urban population was in particular German-speaking, while the vast majority of people lived in the countryside, where Russian and Swedish minorities existed alongside the Estonian majority.

 from the Middle Ages to the resettlement in 1939.

In addition, the specialized library contains around 15,000 titles on East and 
West Prussia
deu. Westpreußen, pol. Prusy Zachodnie

West Prussia is a historical region in present-day northern Poland. The region fell to Prussia as a result of the first partition of Poland-Lithuania in 1772 and received its name from the province of the same name formed by Frederick II in 1775, which also included parts of the historical landscapes of Greater Poland, Pomerania, Pomesania and Kulmerland. The Prussian province lasted in changing borders until the early 20th century. After World War I, parts fell to the Second Polish Republic, founded in 1918. The largest cities in West Prussia include Gdansk (Polish: Gdańsk, today Pomeranian Voivodeship), Elbląg (Polish: Elbląg, today Warmia-Masuria Voivodeship), and Thorn (Polish: Toruń, today Kujawsko-Pomeranian Voivodeship).

, as well as on the German-Baltic settlement areas and topics relating to the integration of displaced persons after 1945. Biographies, prose and poetry of people from the mentioned regions form an important part of the library. The basic stock for the collection came from the OL’s predecessor institution, the East Prussian Hunting Museum (1958–1986), with holdings related to hunting, forestry, agriculture and horse breeding in East Prussia. The holdings of the Museum Stadt Königsberg in Duisburg, which was dissolved in 2016, also form part of the collection. The library is used by the neighboring Nordostinstitut (IKGN e.V.).