Cite

Outline map of the United States by counties / engraved and printed by the U.S. Geological Survey.

MLA

of Agriculture. Division of Publications, United States. Department. Outline Map of the United States by Counties / Engraved and Printed by the U.S. Geological Survey. The Division, 1910. https://collections.library.yale.edu/catalog/15827374.

APA, 6th edition

of Agriculture. Division of Publications, U. S. D. (1910). Outline map of the United States by counties / engraved and printed by the U.S. Geological Survey. [Maps]. The Division, https://collections.library.yale.edu/catalog/15827374.