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*1001#$aBrownell, William A.$_179067100
*24510$aArithmetical abstractions :$bthe movement toward conceptual maturity under differing systems of instruction
*260  $aBerkeley$c1967
*300##$a221 s.$bill.
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*4901#$aPublications in educations / University of California$v17
*830 0$aUniversity of California publications in education$x0068-6425$v17$_27710100
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