Year
.
1972
1 000
1 000
1 000
1973
1 000
2 000
900
1974
3 000
3 000
3 000
1975
1 000
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a It was estimated in the FY 1976 budget estimate that $1 000 000 would be programmed for Earth observatory satellite studies in FY 1975; the category was dropped in the FY 1977 estimate.