Proceedings of the Academy of Natural Sciences of Philadelphia.

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Item Link Original Source
Full view   v.27 pt.1 Jan.-Apr.1875 Pennsylvania State University
Full view   v.35 pt.2 June-Oct.1883 Pennsylvania State University
Full view   v.36 pt.3 Nov.-Dec.1884 Pennsylvania State University
Full view   v.44 1892 Pennsylvania State University
Full view   v.68-69 1916-17 Pennsylvania State University
Full view   v.70-72 1918-20 Pennsylvania State University