I recently purchased a Navy Graflex K-20 handheld. I was also lucky enough to find a copy of the Naval Photography manual from the same mperiod that included instructions for the same model. It says that it takes a 19.5' roll of film with 50 4x5" exposures on it. I checked out Kodak.com and found something that might do. But if anybody out there knows any other company either on-line or in the Seattle area, drop me a line. Thanks.