[proceedings of the fifth annual Harry Steenbock Symposium, held in Madison, Wisconsin, on June 9-11, 1975] Burris, Robert H. Black, Clanton C. text Baltimore University Park Press c1976 monographic xi, 431 p. ; ill. ; 24 cm. Carbon dioxide Plants Primary productivity (Biology) 581 UNI 1976 A031 Or. 0839108944