Proceedings of the Academy of Natural Sciences of Philadelphia.

v.63 (1911)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.67 (1915)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.1 (1841-1843)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.6 (1852-1853)

Proceedings of the Academy of Natural Sciences of Philadelphia.

Proceedings, 100th Anniversary Commemoration meeting (1912)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.12 (1860)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.61 (1909)

Annual record of science and industry.

1876

Annual record of science and industry.

1875

Annual record of science and industry.

1873

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.41 (1889)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.49 (1897)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.66 (1914)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.68 (1916)