(MONTANA) Bischoff, A. Map of North- West part of Montana...Great Northern Line St. Paul, Minneapolis & Manitoba Ry. Pacific Extension. Elbridge H. Beckler, Chief Engineer. Helena, Mont. Scale 1 in.= 2 miles. Pen and ink on oil cloth, 27-1/2 x 36". (Map 34)
MLA
Company, Northern Pacific Railway. (MONTANA) Bischoff, A. Map of North- West Part of Montana...Great Northern Line St. Paul, Minneapolis & Manitoba Ry. Pacific Extension. Elbridge H. Beckler, Chief Engineer. Helena, Mont. Scale 1 in.= 2 Miles. Pen and Ink on Oil Cloth, 27-1/2 x 36". (Map 34). 1891. https://collections.library.yale.edu/catalog/2016954.
APA, 6th edition
Company, N. P. R. (1891). (MONTANA) Bischoff, A. Map of North- West part of Montana...Great Northern Line St. Paul, Minneapolis & Manitoba Ry. Pacific Extension. Elbridge H. Beckler, Chief Engineer. Helena, Mont. Scale 1 in.= 2 miles. Pen and ink on oil cloth, 27-1/2 x 36". (Map 34). https://collections.library.yale.edu/catalog/2016954.
