The ABA block at the Doubletree by Hilton Hotel Pittsburgh - Green Tree is now full. To be placed on a first-come, first-served waitlist for a room, please complete this form, and ABA will notify you if a room becomes available. ABA is working with other hotel properties in the area to insure that all bookseller registrants will have a room. ABA will notify you via email as soon as possible. Please submit each room request separately.