Majewicz, Cary. "Lea & Febiger Records"(PDF). www.hsp.org. The Historical Society of Pennsylvania. Retrieved 29 September 2022.
jstor.org
Lea, Isaac (1871-04-01). "Descriptions of Twenty New Species of Uniones of the United States". Proceedings of the Academy of Natural Sciences of Philadelphia. 23 (2): 189–193. ISSN0097-3157. JSTOR4624172.
Lea, Isaac (1871-04-01). "Descriptions of Twenty New Species of Uniones of the United States". Proceedings of the Academy of Natural Sciences of Philadelphia. 23 (2): 189–193. ISSN0097-3157. JSTOR4624172.