This list was compiled primarily from on-line sources, but also includes the citations for pseudonyms found in Ahearn's "Book Collecting" (1995 edition). It is in a "constant" condition of being upgraded. The major on-line sources consulted were:
(Sources which supplied only a few references apiece are not listed. Many citations are from on-line libraries. Numerous sites have disappeared from the Internet, and are listed without links.)

Many people have written with suggestions and corrections, which are welcome and greatly appreciated. Thank you!

There are certainly innumerable errors of omission, and undoubtedly many of commission. If you know of some which are missing or mis-listed, please don't hesitate to send me e-mail.