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DINWIDDLE R, . (1999). "ESSENTIAL COMPUTERS, SPREADSHEETS, CREATING WORKSHEETS , SORTING DATA, MOVING CELL CONTENTS, DATA SERIES, SETTING UP WORKSHEETS, EDITING, COPYING USING FORMULAS END CALCULATIONS.". NULL: NULL.
DINWIDDLE R, . 1999. "ESSENTIAL COMPUTERS, SPREADSHEETS, CREATING WORKSHEETS , SORTING DATA, MOVING CELL CONTENTS, DATA SERIES, SETTING UP WORKSHEETS, EDITING, COPYING USING FORMULAS END CALCULATIONS.". NULL: NULL.
DINWIDDLE R, . "ESSENTIAL COMPUTERS, SPREADSHEETS, CREATING WORKSHEETS , SORTING DATA, MOVING CELL CONTENTS, DATA SERIES, SETTING UP WORKSHEETS, EDITING, COPYING USING FORMULAS END CALCULATIONS.". NULL: NULL. 1999.