Arctic America. Eastern sheet : on a scale of 1:10,000,000 / by Dr. F. Boas.
MLA
Boas, Franz, 1858-1942. Arctic America. Eastern sheet : on a scale of 1:10,000,000 / by Dr. F. Boas.. [1887]. https://collections.library.yale.edu/catalog/16682152.
APA, 6th edition
Boas, Franz, 1858-1942. ([1887])[Arctic America. Eastern sheet : on a scale of 1:10,000,000 / by Dr. F. Boas.]. https://collections.library.yale.edu/catalog/16682152.