Blockhouse drawing, sheet No. 2

Chicago citation style
Blockhouse drawing, sheet No. 2. Retrieved from the Digital Public Library of America, http://cdm15138.contentdm.oclc.org/cdm/ref/collection/p15138coll19/id/58. (Accessed October 21, 2018.)
APA citation style
Blockhouse drawing, sheet No. 2. Retrieved from the Digital Public Library of America, http://cdm15138.contentdm.oclc.org/cdm/ref/collection/p15138coll19/id/58
MLA citation style
Retrieved from the Digital Public Library of America <http://cdm15138.contentdm.oclc.org/cdm/ref/collection/p15138coll19/id/58>.
Note: These citations are programmatically generated and may be incomplete.