Railroad workers probably Northern Pacific Railroad employees, n.d

Chicago citation style
Railroad workers probably Northern Pacific Railroad employees, n.d. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/transportation/id/46. (Accessed July 17, 2018.)
APA citation style
Railroad workers probably Northern Pacific Railroad employees, n.d. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/transportation/id/46
MLA citation style
Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/transportation/id/46>.
Note: These citations are programmatically generated and may be incomplete.