Batson, William A.
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14

Relative difficulty on number combinations in addition and ..:

Batson, William H. ; Combellick, Olin E.
Journal of Educational Psychology.  16 (1925)  7 - p. 467-481 , 1925
 
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15

Acquisition of skill:

Batson, William Howard
The Psychological Monographs.  21 (1916)  3 - p. i-100 , 1916
 
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