na INLIS000000000003260 Ind 0010-1118003260 Seed ecology : proceedings EASTER SCHOOL IN AGRICULTURAL SCIENCE (19 th : 1972 : University of Nattingham) edited by W. Heydecker University Park, Pennsylvania State University Press 578 p. ill.; 23 cm. 578 p. ill.; 23 cm. 582.4 SEEDS ECOLOGY CONGRESSES 213/92