Elementary science / Dublin, Peter. Pressman, Harvey. Barnett, Eileen. Science Science 372 HAR 1994 A021 Or. System requirements for computer disk: IBM-compatible PC; 640K RAM; DOS 3.3 or later; Epson, IBM/ProPrinter, HP LaserJet or compatible printer. New York : HarperCollins College Publishers, c1994. c1994. Text 176 p. :