Requested reference
Cockerell, T. D. A. (1924). Fossil insects (also arachnids) in the United States National Museum. Proceedings of the United States National Museum 64(13): 1-15. 
-- Show included taxa
Cockerell, T. D. A. (1924). Fossil insects (also arachnids) in the United States National Museum. Proceedings of the United States National Museum 64(13): 1-15. -- Show included taxa