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The center, the group under observation, sources of informa.. 

, In: Studies from the Center for Research in Child Health and Development, School of Public Health, Harvard University
1,
Monographs of the Society for Research in Child Development ; 20 = 4,1
Stuart, Harold C. - Repr. [d. Ausg.] Washington, DC 1939 . , 1966
Exemplar:  Zentrale:Magazin 01.m.1594