rr-env-Alternate_Sources_of_Energy (1973 ) - (1981 )

1973 :
X
1974:
X
X
X
X
1:Winter 2:Spring 3:Summer 4:Fall
1975:
X
X
1976:
X
X
X
X
1977:
X
X
X
1978:
1979:
X
X
1:Winter 2:Spring 3:Summer 4:Fall
1980:
X
X
X
X
1981:
X

#12 4
73: 3
10 & 11/73
74: 1-4
13 - 16
75: 3-4
18 (July), (Equip Directory), 19 [Dec]
76: 1-4
20 - 23
77: 1-3
24-27
Feb, Apr, June
79: 3-4
29-30
7 & 8/ 79, 9 & 10/79
80: 1-4
31-34
3 & 4, 5 & 6, 7 & 8, 9 & 10
81: 2
35
3 & 4