Lesley, J. P. (1885). The geology of Huntingdon County: Illustrated by a colored geological map of the county; a topographical map of part of Bald Eagle Mountain; a topographical map of part of Nittany Valley; a sheet of coal measure columnar sections; a sheet of Paleozoic columnar sections; two heliotype page plates and 64 page plate maps and sections. Board of Commissioners.
Chicago-Zitierstil (17. Ausg.)Lesley, J. P. The Geology of Huntingdon County: Illustrated by a Colored Geological Map of the County; a Topographical Map of Part of Bald Eagle Mountain; a Topographical Map of Part of Nittany Valley; a Sheet of Coal Measure Columnar Sections; a Sheet of Paleozoic Columnar Sections; Two Heliotype Page Plates and 64 Page Plate Maps and Sections. Harrisburg: Board of Commissioners, 1885.
MLA-Zitierstil (9. Ausg.)Lesley, J. P. The Geology of Huntingdon County: Illustrated by a Colored Geological Map of the County; a Topographical Map of Part of Bald Eagle Mountain; a Topographical Map of Part of Nittany Valley; a Sheet of Coal Measure Columnar Sections; a Sheet of Paleozoic Columnar Sections; Two Heliotype Page Plates and 64 Page Plate Maps and Sections. Board of Commissioners, 1885.