Mango Languages From your current official e-mail account, send an e-mail with your name and rank to the Aviano Library at 31FSS.FSDL@Aviano.af.mil. You will then receive your library card number by return e-mail. Go to www.usafelibraries.org, click the Information Databases box and select Access via library card. Enter the library card number. Scroll down to access Mango Languages. Once you arrive to Aviano AB, stop by the library to pick up your card and complete the library registration process.