Cite

[No. 1009. View of the Denver and Rio Grande Railroad narrow gauge tracks near the Arkansas River in Royal Gorge, Fremont County, Colorado]

MLA

Jackson, William Henry, 1843-1942. [No. 1009. View of the Denver and Rio Grande Railroad narrow gauge tracks near the Arkansas River in Royal Gorge, Fremont County, Colorado]. Folder 44. 1878-1898. https://collections.library.yale.edu/catalog/2016818.

APA, 6th edition

Jackson, William Henry, 1843-1942. (["Folder 44"])(1878-1898)[[No. 1009. View of the Denver and Rio Grande Railroad narrow gauge tracks near the Arkansas River in Royal Gorge, Fremont County, Colorado]]. https://collections.library.yale.edu/catalog/2016818.