[No. 1198. The Loop Near Georgetown, Colorado. View of the Georgetown Loop and tracks of the Colorado Central Railroad in Clear Creek Canyon above Georgetown (Clear Creek County), Colorado. Shows train trestle and Clear Creek]
MLA
Jackson, William Henry, 1843-1942. [No. 1198. The Loop Near Georgetown, Colorado. View of the Georgetown Loop and tracks of the Colorado Central Railroad in Clear Creek Canyon above Georgetown (Clear Creek County), Colorado. Shows train trestle and Clear Creek]. Folder 29. 1879. https://collections.library.yale.edu/catalog/2016803.
APA, 6th edition
Jackson, William Henry, 1843-1942. (["Folder 29"])(1879)[[No. 1198. The Loop Near Georgetown, Colorado. View of the Georgetown Loop and tracks of the Colorado Central Railroad in Clear Creek Canyon above Georgetown (Clear Creek County), Colorado. Shows train trestle and Clear Creek]]. https://collections.library.yale.edu/catalog/2016803.