Map of the White Mountains, New Hampshire : from original surveys / by Harvey Boardman, 1858 / engraved by Smith Knight & Tappan, Boston.
MLA
Boardman, Harvey. Map of the White Mountains, New Hampshire : from Original Surveys / by Harvey Boardman, 1858 / Engraved by Smith Knight & Tappan, Boston. Harvey Boardman , 0AD. https://collections.library.yale.edu/catalog/15827449.
APA, 6th edition
Boardman, H. (0 C.E.). Map of the White Mountains, New Hampshire : from original surveys / by Harvey Boardman, 1858 / engraved by Smith Knight & Tappan, Boston. [Maps]. Harvey Boardman , https://collections.library.yale.edu/catalog/15827449.