Cite

The Heintzelman Mine, at Cerro Colorado, Near Tubac, Arizona.

MLA

The Heintzelman Mine, at Cerro Colorado, Near Tubac, Arizona. 0AD. https://collections.library.yale.edu/catalog/2018331.

APA, 6th edition

The Heintzelman Mine, at Cerro Colorado, Near Tubac, Arizona. (0 C.E.). [Frontispieces (Illustrations)]. https://collections.library.yale.edu/catalog/2018331.