Clemens, B., 1860. Contributions to American lepidopterology. Proceedings of the Academy of Natural Sciences of Philadelphia, 12:
4–15, 156–174, 203–221, 345–362, 522–547.
Includes:
Clemens, B., 1860. Contributions to American lepidopterology - No. 4. Proceedings of the Academy of Natural Sciences of Philadelphia 12: 156-174.
(1)
Clemens, B., 1860. Contributions to American lepidopterology - No. 5. Proceedings of the Academy of Natural Sciences of Philadelphia 12: 203-221.
(2)
Clemens, B., 1860. Contributions to American lepidopterology - No. 6. Proceedings of the Academy of Natural Sciences of Philadelphia 12: 345-362.
(3)