Matches in DBpedia 2016-04 for { <http://history.nasa.gov/monograph21.pdf> ?p ?o }
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- monograph21.pdf date "February 2001".
- monograph21.pdf first "David S.".
- monograph21.pdf format "PDF".
- monograph21.pdf isCitedBy Ernst_Stuhlinger.
- monograph21.pdf journal "Monographs in Aerospace History Series".
- monograph21.pdf last "Portree".
- monograph21.pdf title "Humans to Mars: Fifty years of mission planning".
- monograph21.pdf url monograph21.pdf.
- monograph21.pdf volume "21".