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- 68062079%2F%2Fr893 contributor B1871610.
- 68062079%2F%2Fr893 created "1968.".
- 68062079%2F%2Fr893 date "1968".
- 68062079%2F%2Fr893 date "1968.".
- 68062079%2F%2Fr893 dateCopyrighted "1968.".
- 68062079%2F%2Fr893 extent "76 p.".
- 68062079%2F%2Fr893 isPartOf "National Academy of Sciences, Washington, D.C., Publication ; 1688".
- 68062079%2F%2Fr893 isPartOf "Publication (National Research Council (U.S.)) ; no. 1688.".
- 68062079%2F%2Fr893 issued "1968".
- 68062079%2F%2Fr893 issued "1968.".
- 68062079%2F%2Fr893 language "eng".
- 68062079%2F%2Fr893 publisher "Washington,".
- 68062079%2F%2Fr893 subject "523.4".
- 68062079%2F%2Fr893 subject "Astronautics in astronomy.".
- 68062079%2F%2Fr893 subject "Planets".
- 68062079%2F%2Fr893 subject "QB601 .N37".
- 68062079%2F%2Fr893 title "Planetary astronomy; an appraisal of ground-based opportunities.".
- 68062079%2F%2Fr893 type "text".