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Hacker Sidney G, Barnes Wilfred E & Long Calvin T. (1963). Fundamental concepts of arithmetic. : .
Hacker Sidney G, Barnes Wilfred E and Long Calvin T. 1963. Fundamental concepts of arithmetic. : .
Hacker Sidney G, Barnes Wilfred E and Long Calvin T. (1963). Fundamental concepts of arithmetic. : .
Hacker Sidney G, Barnes Wilfred E and Long Calvin T. Fundamental concepts of arithmetic. : . 1963.