The what-if of counting.
Shipley
E F
EF
Department of Psychology, University of Pennsylvania, Philadelphia 19104.
Shepperson
B
B
D001288:Attention; D002648:Child; D002675:Child, Preschool; D003210:Concept Formation; D004193:Discrimination Learning; D006801:Humans; D007804:Language Development; D008433:Mathematics; D011340:Problem Solving