The best known are the birch bark letters written in Siberia, which were included in the Latvian National Register of UNESCO’s Memory of the World programme in 2009. The museum holds 14 letters and the written and visual evidence associated with them. In 2018, a catalogue of all birch bark letters held by Latvian museums was compiled.

 The oldest written objects in the collection date back to the 18th century, particularly significant is the message found in the tower spire sphere of the Tukums Evangelical Lutheran Church of the Holy Trinity from 1754.

 Alongside birth, baptismal and marriage certificates, the collection also includes documents of more administrative nature. Such as individual protocol books of Tukums Town Board and Magistrate, school documents, etc. In letters and diaries, the fate of the people involved in the events of 1905 and the 20th century wars are revealed.

The collection of printed works includes publications by Ernests Birznieks-Upītis, Ansis Lerhis-Puškaitis and other authors from Tukums Municipality, as well as local periodicals.