"On the 117 rolls of this microfilm publication are reproduced a series of letters received by the Secretary of War from the President, executive departments, and War Department bureaus during the period February 1862 to December 1870. ... The letters reproduced here are part of Record Group 107, Records of the Office of the Secretary of War." -- P. 2, 4.
"On the 12 rolls of this microfilm publication are reproduced 22 bound volumes of registers of letters received by the Secretary of War from the President, executive departments, and War Department bureaus during the period February 5, 1862, to December 31, 1870. ... The registers reproduced here are part of Record Group 107, Records of the Office of the Secretary of War." -- P. 1, 3.
"On the 5 rolls of this microfilm publication are reproduced 10 bound volumes of record copies of letters sent by the Secretary of War to the President, other departments, and bureaus of the War Department during the period May 1, 1863, to December 31, 1870. ... The volumes reproduced are part of Record Group 107, Records of the Office of the Secretary of War." -- p. 2-3.