Cita APA (7a ed.)

Lesley, J. P. A geological hand atlas of the sixty-seven counties of Pennsylvania, embodying the results of the field work of the survey, from 1879 to 1884.

Cita Chicago Style (17a ed.)

Lesley, John Peter. A Geological Hand Atlas of the Sixty-seven Counties of Pennsylvania, Embodying the Results of the Field Work of the Survey, from 1879 to 1884. Harrisburg.

Cita MLA (8a ed.)

Lesley, John Peter. A Geological Hand Atlas of the Sixty-seven Counties of Pennsylvania, Embodying the Results of the Field Work of the Survey, from 1879 to 1884.