Cite

Johnson's World on Mercators projection / published by Johnson and Ward.

MLA

Johnson's World on Mercators Projection / Published by Johnson and Ward. Johnson and Ward, 1866. https://collections.library.yale.edu/catalog/15234631.

APA, 6th edition

Johnson's World on Mercators projection / published by Johnson and Ward. (1866). [Maps]. Johnson and Ward, https://collections.library.yale.edu/catalog/15234631.