NASA NTRS · 19730014054
Earth orbital experiment program and requirements study. Volume 4: Space astronomy (appendices A, B, C, D) and space physics (appendices A, B, C)
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1971-01-01. Earth orbital experiment program and requirements study. Volume 4: Space astronomy (appendices A, B, C, D) and space physics (appendices A, B, C). https://ntrs.nasa.gov/citations/19730014054
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