Note 1: If you can not open the downloaded file, and your Adobe Reader reports on the damaged file, then update your Adobe Reader. Because I have installed Adobe Reader 8.1.1 and ALL my uploaded files open fine in version 8.1.1.

Flying Boats and Seaplanes since 1910 ISBN: 071370537X
Balloons and airships, 1783-1973 ISBN: 071370568X
Airliners Between the Wars, 1919-39 ISBN: 0713705671
Bombers, Patrol and Reconnaissance Aircraft 1914 -1919 ISBN: 0713706328
Airliners Since 1946 ISBN: 0713706961
Bombers in service: Patrol and transport aircraft since 1960 ISBN: 0713707445