Cite

Portland street map / [prepared for] Union Oil Company.

MLA

McNally, Rand, and Company. Portland Street Map / [Prepared for] Union Oil Company. Rand McNally, 0AD. https://collections.library.yale.edu/catalog/15821595.

APA, 6th edition

McNally, R., & C. (0 C.E.). Portland street map / [prepared for] Union Oil Company. [Maps]. Rand McNally, https://collections.library.yale.edu/catalog/15821595.