Lesley, J. P. (1885). Geological hand-atlas of the 67 counties of Pennsylvania: Extra edition, on heavy paper, unfolded, and without prefatory text of all maps contained in the "Geological hand atlas" of the 67 counties of Pennsylvania. Second Geological Survey.
Chicago-Zitierstil (17. Ausg.)Lesley, J. P. Geological Hand-atlas of the 67 Counties of Pennsylvania: Extra Edition, on Heavy Paper, Unfolded, and Without Prefatory Text of All Maps Contained in the "Geological Hand Atlas" of the 67 Counties of Pennsylvania. Harrisburg: Second Geological Survey, 1885.
MLA-Zitierstil (9. Ausg.)Lesley, J. P. Geological Hand-atlas of the 67 Counties of Pennsylvania: Extra Edition, on Heavy Paper, Unfolded, and Without Prefatory Text of All Maps Contained in the "Geological Hand Atlas" of the 67 Counties of Pennsylvania. Second Geological Survey, 1885.