B:
Bridges - Science Tracer Bullet - Bridges - Science Tracer Bullets - Research Finding Aids from the Library of Congress, Science Reference Services. [U.S. Library of Congress (LOC)]

R:
Record Group 198: Records of the Board of Investigation and Research-Transportation, 1940 - 1944 - National Archives' Archival Research Catalog description for Record Group 198: Records of the Board of Investigation and Research-Transportation, 1940 - 1944 [U.S. National Archives and Records Administration (NARA)]

Record Group 298: Records of the Office of Naval Research, 1941 - 1970 - National Archives' Archival Research Catalog description for Record Group 298: Records of the Office of Naval Research, 1941 - 1970 [U.S. National Archives and Records Administration (NARA)]