- Friend, R. B. 1943. Connecticut State Entomologist, 42nd Report 1942 Connecticut Agricultural Experiment Station, Bulletin. 472207-315.
- Britton, W. E., and R. B. Friend. 1935. Insect pests of elms in Connecticut [Scolytidae, p. 268, 396-399]. Connecticut Agricultural Experiment Station, Bulletin 369.
- Friend, R. B. 1940. Connecticut State Entomologist, 39th Report . Connecticut Agricultural Experiment Station, Bulletin 434222-223, 293-331.
- Friend, R. B. 1941. Connecticut State Entomologist, 40th Report . Connecticut Agricultural Experiment Station, Bulletin 445:295-384.
- Friend, R. B. 1942a. Connecticut State Entomologist 41st Report, 1941 . Connecticut Agricultural Experiment Station, Bulletin 461463-466, 537-541.
- Friend, R. B. 1942b. Enemies of loblolly pine . Yale University, School of Forestry, Bulletin 49:143-146.
- Friend, R. B. 1944. Connecticut State Entomologist, 43rd Report. 1943. Connecticut Agricultural Experiment Station, Bulletin 481:235-237, 241, 298-302.
- Friend, R. B. 1945. Connecticut State Entomologist 44th Report, 1944 . Connecticut Agricultural Experiment Station, Bulletin 488301, 322-323, 358-359.
- Friend, R. B. 1946. Connecticut State Entomologist 45th Report, 1945 . Connecticut Agricultural Experiment Station, Bulletin 501:32-34.