Cite

Official tourist map of the state of Washington / Washington State Progress Commission ; Kroll Map Co.

MLA

Kroll Map Company, inc. Official Tourist Map of the State of Washington / Washington State Progress Commission ; Kroll Map Co. The Commission, 0AD. https://collections.library.yale.edu/catalog/15821697.

APA, 6th edition

Kroll Map Company, inc. (0 C.E.). Official tourist map of the state of Washington / Washington State Progress Commission ; Kroll Map Co. [Tourist maps]. The Commission, https://collections.library.yale.edu/catalog/15821697.