ISBN 9781580375283 books & textbook
Mark Twain - Astronomy, Grades 6 - 12 (Expanding Science Skills Series)
Powers Ph.D., Don Beaver Ph.D., John B.
Mark Twain Media /2010-01-04 Paperback / 80 Pages
isbn-10: 1580375286 / isbn-13: 9781580375283
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