Environmental effects on crop physiology : proceedings of a symposium held at Long Ashton Research Station, University of Bristol, 13-16 April 1975 / Landsberg, J. J. Cutting, C. V. Crops and climate Crops Crops 630 ACA 1977 A055 Or. At head of title: Fifth Long Ashton Symposium 1975. London ; New York : Academic Press, 1977. 1977. Text xvi, 388 p. :