Thanks to all who responded on sources for banding codes. In a private email, I was sent the following url: http://transgulf.org/species_codes.html to go to an alphabetical listing. Looks like that will be pretty useful, as long as you can remember the full AOU name for every species. A propos of previous discussions, I see LTDU is not presently in use, but OLDS still is! Scott Crabtree Baltimore, MD