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1

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Journal of a botanical excursion in the northeastern parts of the states of Pennsylvania and New York : during the year 1807 /

by Pursh, Frederick (1774-1820).
Published 1869

Book

2

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Report on the birds of Pennsylvania : with special reference to the food habits, based on over three thousand stomach examinations /

Published 1888

Book

3

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The ancient volcanic rocks of South mountain, Pennsylvania /

by Bascom, F. (1862-1945)
Published 1896

Book

4

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A study of the igneous rocks at York Haven and Stony Brook, Pa. and their accompanying formations ... /

by Ehrenfeld, Frederick (1872-1940).
Published 1898

Book

5

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Cambro-Silurian limonite ores of Pennsylvania /

by Hopkins, Thomas Cramer (1861-).
Published 1900

Book