00606nam a2200193Ia 4500 CTU_79056 210402s9999 xx 000 0 und d 306.3 C215 Cancian, Frank The innovator's situation : Upper-middle-class conservatism in agricultural communities Frank Cancian Stanford Stanford University Press 1979 Agricultural innovations,Diffusion of innovations,Farmers Economic conditions Trung tâm Học liệu Trường Đại học Cần Thơ