Science Research Council (Great Britain), Royal Greenwich Observatory
Royal Greenwich Observatory
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Science Museum (Great Britain), Calvert, H. R.
Her Majesty's Stationery Office London.
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South African National Council for Scientific and Industrial Research
South African National Council for Scientific and Industrial Research
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National Research Council (U.S.)
National Academy Press
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Science Research Council (Great Britain), Royal Greenwich Observatory
Science Research Council : Royal Greenwich Observatory
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Great Britain. Nautical Almanac Office
H.M.S.O
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United States Naval Observatory
G.P.O.
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Institute of Physics (Great Britain)
Institute of Physics
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British National Committee on Space Research
The Royal Society
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Study on Priorities in Space Science and Earth Observations, Woods Hole, Mass., 1970, National Research Council (U.S.). …
National Academy of Sciences
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National Academy of Sciences (U.S.), National Research Council, National Research Council (U.S.). Space Science Board
National Academy of Sciences
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Kilkenny, David, Lastovica, Ethleen, Menzies, John W., Cousins, Alan W. J.
South African Astronomical Observatory
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