TULLY, John P «Oceanography, Science of the Sea» Ottawa, Department of Fisheries of Canada, 1953. 19 p. (26 cm). Profusely illustrated. (Inv. #16747) 20 $
TWENHOFEL, W.H «The Anticosti Island Faunas» Ottawa, Department of Mines â Geological Survey, 1914. 38 p. (25 cm). Museum Bulletin No. 3, Geological Series No. 19. With a plate. (Inv. #20347) 30 $
TWINN, C.R «Control of Bedbugs, Fleas, Lice and Wasps» Ottawa, Canada Department of Agriculture, Entomology Division, March 1956. 10 p. (25 cm). Publication 969. Illustrations. Cover-title. (Inv. #4108) 12 $
TWINN, C.R «Flies and their control» Ottawa, Canada Department of Agriculture, Science Service, Entomology Division, February 1955. 6 p. (24 cm). Publication 933. (Inv. #6033) 12 $
TWINN, C.R «Lutte contre les Rats et les Souris» Ottawa, Ministère de l'Agriculture, Division de l'Entomologie, 1957. 8 p. (25 cm). Publication #972. Illustrations. (Inv. #35894) 12 $
TWINN, C.R. & PETERSON, D.G «Control of Black Flies in Canada» Ottawa, Canada Department of Agriculture, Science Service, Entomology Division, April 1955. 9 p. (24 cm). Publication 940. Illustrations. (Inv. #4109) 12 $
TWINN, C.R. & PETERSON, D.G «Control of Mosquitoes in Canada» Ottawa, Canada Department of Agriculture, Science Service, Entomology Division, June 1955. 14 p. (25 cm). Publication 936. Illustrations. Cover-title. (Inv. #4115) 15 $
TWINN, C.R. & PETERSON, D.G «Lutte contre les maringouins au Canada» Ottawa, Ministère de l'Agriculture du Canada, Division de l'Entomologie, 1955. 15 p. (25 cm). Nombreuses illustrations. Publication 936. (Inv. #34989) 12 $