Proceedings of the Academy of Natural Sciences of Philadelphia.

v.48 (1896)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.27 (1875)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.17 (1865)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.13 (1861)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.39 (1887)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.74 (1922)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.26 (1874)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.38 (1886)

Transactions of the Natural History Society of Glasgow.

new ser. v. 2 (1886-1888)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.24 (1872)

Natural science.

v. 7 (1895)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.7 (1854-1855)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.64 (1912)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.63 (1911)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.67 (1915)