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1993 | 9783540560791 | 221 pages
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Enslow Pub Inc | 1981 | 9780894900341 | 224 pages
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RAND Corporation | 9780833042279 | 176 pages
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Alpha | 1998 | 9780028627021 | 192 pages
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girroDavid Levys Guide to Observing and Discovering Comets
University | 2003 | 9780521826563 | 188 pages
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