United States Strategic Bombing Survey

The United States Strategic Bombing Survey (USSBS) was a written report created by a board of experts assembled to produce an impartial assessment of the effects of the Anglo-American strategic bombing of Nazi Germany during the European theatre of World War II. After publishing the report in 1945, the Survey members then turned their attention to the war efforts against Imperial Japan during the Pacific War, including a separate section on the recent use of the atomic bomb in attacks on two Japanese cities. In total, the reports contained 208 volumes for Europe and another 108 for the Pacific, comprising thousands of pages.

Source: Wikipedia — United States Strategic Bombing Survey (CC BY-SA 4.0)