Williams' new trans-continental map of the Pacific R.R. and routes of overland travel to Colorado, Nebraska, the Black Hills, Utah, Idaho, Nevada, Montana, California and the Pacific coast / Henry T. Williams.
MLA
Williams, Henry T. Williams' New Trans-Continental Map of the Pacific R.R. and Routes of Overland Travel to Colorado, Nebraska, the Black Hills, Utah, Idaho, Nevada, Montana, California and the Pacific Coast / Henry T. Williams. H.T. William, 0AD. https://collections.library.yale.edu/catalog/15813020.
APA, 6th edition
Williams, H. T. (0 C.E.). Williams' new trans-continental map of the Pacific R.R. and routes of overland travel to Colorado, Nebraska, the Black Hills, Utah, Idaho, Nevada, Montana, California and the Pacific coast / Henry T. Williams. [Maps]. H.T. William, https://collections.library.yale.edu/catalog/15813020.