Map showing the location of cliff dwellings and natural bridges : San Juan basin, Utah-Arizona / compiled from official records and original surveys by W.B. Douglass, examiner of surveys, G.L.O.
MLA
Douglass, W. B. Map Showing the Location of Cliff Dwellings and Natural Bridges : San Juan Basin, Utah-Arizona / Compiled from Official Records and Original Surveys by W.B. Douglass, Examiner of Surveys, G.L.O. s.n.], 1909. https://collections.library.yale.edu/catalog/15818497.
APA, 6th edition
Douglass, W. B. (1909). Map showing the location of cliff dwellings and natural bridges : San Juan basin, Utah-Arizona / compiled from official records and original surveys by W.B. Douglass, examiner of surveys, G.L.O. [Maps]. s.n.], https://collections.library.yale.edu/catalog/15818497.
