Cite

Lewis' map of Fraser River : showing the surrounding country and also the various overland routes leading to it, compiled from government surveys.

MLA

Lewis, George W. Lewis' Map of Fraser River : Showing the Surrounding Country and Also the Various Overland Routes Leading to It, Compiled from Government Surveys. Lith. & pub. by G.W. Lewis, 0AD. https://collections.library.yale.edu/catalog/15812947.

APA, 6th edition

Lewis, G. W. (0 C.E.). Lewis' map of Fraser River : showing the surrounding country and also the various overland routes leading to it, compiled from government surveys. [Maps]. Lith. & pub. by G.W. Lewis, https://collections.library.yale.edu/catalog/15812947.