MLA

DeBow, S. Herries. Map of the Richmond Coal Field / by S. Herries De Bow, Mining Engineer, Geol, &c. ; Lith. of Ritchie & Dunnavant, Richmond, Va. published by S.H. De Bow, 1858. https://collections.library.yale.edu/catalog/15811282.

APA, 6th edition

DeBow, S. H. (1858). Map of the Richmond coal field / by S. Herries De Bow, Mining Engineer, Geol, &c. ; lith. of Ritchie & Dunnavant, Richmond, Va. [Maps]. published by S.H. De Bow, https://collections.library.yale.edu/catalog/15811282.