This accession consists of four cartographic sheets which collectively are entitled Map of Great Slave Lake and Hudson Bay. They were originally published by the Federal government in 1900 and reprinted in 1923, to accompany a report by J.B. Tyrell. They are stamped Department of Interior-Yukon and Northwest Territories Branch. They are annotated with the inscription "help yourself". (:0001) is entitled Sheet No. 1 and shows McLeod Bay in the east end of Great Slave Lake, the water route to Artillery Lake, Lac Du Bois, Casba Lake, Campbell Lake and Sifton Lake. (:0002) is entitled Sheet No. 2 and shows the Thelon River. It includes Granite Falls and Hanbury River. (:0003) Sheet No. 3A and 3B shows the Thelon River and includes Beverly Lake and Aberdeen Lake. (:0004) is entitled Sheet No. 4 and shows the lower Thelon River and includes Schultz Lake and Baker Lake. The maps also show Dene and Inuit encampments along the Thelon River. There are no copies of these maps on deposit with either the National Archives of Canada or the National Museum of Civilization.