Search for: Title Author Subject Series that begins with: 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings > Browse Headings # Ptak, Aaron J. 1 Ptak, Aaron Joseph -- SEE: Ptak, Aaron J. 1 Ptak, Claire 3 Ptak, John 1 PTFEAD -- SEE: United States. Presidential Task Force on Employment of Adults with Disabilities 1 PTI -- SEE: Preservation Technologies, Inc. 1 SEE: Public Technology, inc. 1 Ptica, Iz 1 Kajfez, Kaja 3 PTO -- SEE: United States. Patent and Trademark Office 3 Ptskialadze, Giorgi 1 Ptushko, A. 1900-1973 1 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings >