Technical Order No. 01-20EF-2, Air Publication No.2099C. Erection And Maintenance Instructions for the Army Model B-17F Airplanes, British Model Fortress II. 1943/4 Revisions, approximately136p. Looseleaf format within a card folder. Restricted document which is incomplete. It begins at page 31 and ends at 467 but has a few duplicated pages and a lot of gaps. I would assume that these pages were relevant to the owner (Named on cover to John Red 974 Bomb Group, 341st Bomb Squadron). Information within this folder covers engine starting/stopping and pre-flight inspections and regular maintenance checks (pages 31 - 100 or so); Disassembly, replacement and minor repair (incomplete). Illustrated with photographs and diagrams. Good condition. Stock code P17080.