"An undated cover letter regarding the transmission of a report on a guide to captured German documents."@en . . "1 letter"@en . "Correspondence with Air University - Human Resources Research Institute"@en . . . . . "-1-1" . "The Air University is a US Air Force center for professional military education."@en . "This material has been digitised. Readers should book a reading room terminal to access it."@en . . "WL3000/9/1/48" . .