This is the first supplement to the Galveston Bay Bibliography, bringing an additional 1063 references to the bibliography and including references from the Galveston Bay National Estuary Program technical publication series through GBNEP-23 (except for GBNEP-21 and -22). The bibliography includes subject, author and geographic term indexes, an abbreviations list, and other searching tools. Approximately 50% of the references cited are available from the Galveston Bay Information Center, Texas Institute of Oceanography, Texas A&M University Galveston Campus. The bibliography is also available in electronic form, accessible by modem and network connections.