-
61
-
62
-
63
-
64
-
65
-
66
-
67Energy in agriculture : on modeling energy inputs in AGRIMOD : final report, August 1976-June 1977 /Published 1977Government Document Book
-
68
-
69
-
70
-
71Published 1979Government Document Book
-
72Government Document Book
-
73
-
74
-
75
-
76Published 1979Government Document Book
-
77Government Document Book
-
78
-
79Published 1978Government Document Book
-
80