Say, Thomas. (1859). American entomology : a description of the insects of North America, with illustrations drawn and colored after nature (edited by John L. LeConte; with a memoir of the author by George Ord). Boston: Estes & Lauriat, 2 volumes.

A lovely historical work. High resolution scans of individual plates (at the end of each volume) can be downloaded JPEG files. (Formerly they were JPEG2000.) Many of the plates are lovely, and it is fascinating to see the first illustrations and descriptions of many of our common species. Thomas Say was a pioneer of entomology in the United States.

This probably should have been linked as a book, which would have made the bibliographic formatting automatic.