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Conceptual physical science /

New York : HarperCollins College Publishers, 1994 . xix, 795 p. : , Includes index. 27 cm.. 0673463796

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Elementary science /

New York : HarperCollins College Publishers, 1994 . 176 p. : , System requirements for computer disk: IBM-compatible PC; 640K RAM; DOS 3.3 or later; Epson, IBM/ProPrinter, HP LaserJet or compatible printer. 24 cm. +. 0065016742

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American government :

New York, NY : HarperCollins College Publishers, 1995 . xix, 553 p. : 23 cm.. 0673469298

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