Workers widening center bore with Denver Ring drills, Cascade Tunnel, 1927

Chicago citation style
Pickett, Lee. Workers widening center bore with Denver Ring drills, Cascade Tunnel, 1927. 1927. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/pickett/id/449. (Accessed September 19, 2018.)
APA citation style
Pickett, Lee, (1927) Workers widening center bore with Denver Ring drills, Cascade Tunnel, 1927. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/pickett/id/449
MLA citation style
Pickett, Lee. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/pickett/id/449>.
Note: These citations are programmatically generated and may be incomplete.