00511nam a2200157Ia 4500003000900000008004100009020001800050040001600068080001200084100002000096245012000116260005200236300001000288650001400298650004100312IN-BaIIA211028s9999    xx            000 0 eng d  a0-87474-359-1  cIIA Library  a52bDEV  aDevorkin, D. H. 0aPractical astronomyblectures on time, place and spacecD H Devorkin                                                 aWashingtonbNational Air and Space Museumc1986  a109p.  aAstronomy  aAstronomy and Astrophysics Thesaurus