Cosmos : a sketch of a physical description of the universe / By Alexander von Humboldt ; Translated from the German by E.C. Otté.

5

Text-book of the embryology of invertebrates / by Dr. E. Korschelt [and] Dr. K. Heider. Tr. from the German.

pt. 2

Contributions from the Botanical Laboratory of the University of Pennsylvania.

1, 1892-1897

Contributions from the Botanical Laboratory of the University of Pennsylvania.

5, 1919-1920

Bandringa rayi: a new Ctenacanthoid shark from the Pennsylvania Essex fauna of Illinois / Rainer Zangerl --

v.12:no.10(1969)

Plant physiology, by Vladimir I. Palladin. Authorized English ed. based on the German translation of the 6th Russian ed. and on the 7th Russian ed. (1914) Edited by Burton Edward Livingston.

2nd ed.

Annual report of the Pennsylvania Department of Agriculture ...

9

Annual report of the Pennsylvania Department of Agriculture ...

7, pt. 2

Annual report of the Pennsylvania Department of Agriculture ...

6, pt. 2

Annual report of the Pennsylvania Department of Agriculture ...

7, pt. 1

Annual report of the Pennsylvania Department of Agriculture ...

13

Annual report of the Pennsylvania Department of Agriculture ...

8, pt. 1

Annual report of the Pennsylvania Department of Agriculture ...

17

Annual report of the Pennsylvania Department of Agriculture ...

10

Annual report of the Pennsylvania Department of Agriculture ...

16