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Map of Pennsylvania colored to illustrate the distribution of its flora by Thos. C. Porter, Professor of Botany in Lafayette College, Easton, Pa. Engraved by W.S. Barnard, N.Y. (Published by Stedman, Brown & Lyon, Philadelphia, 1872)
who: Porter, Thomas Conrad, 1822-1901; Stedman, Brown, Lyon; Barnard, William S.; Walling, H. F.; Gray, Ormando Willis
what: Vegetation; State Atlas; Atlas Map
when: 1872
where: Pennsylvania
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