Not all barcodes are alike. If you're not sure whether you have a Codabar, Code 39 or something else, check out these links. It may affect how you enter your data into the registry.
Here is a sampling of vendors who sell barcodes. These are offered for information only and does not imply an endorsement from the Alaska State Library.
To find whether a particular identifier is being used, open the PDF file, then hit control-f, and search for the identifier you want to use.
If you don't find your proposed identifier, you're good to go. Otherwise, please consult your system administrator.
PO Box 110571
Juneau AK 99811-0571
395 Whittier Street
Juneau AK 99801