Burt's separated twins: the larger picture.
Tucker
William H
WH
Rutgers University-Camden, USA.
D002648:Child; D004493:Education / Q000266:history; D004739:England; D049673:History, 20th Century; D006801:Humans; D007360:Intelligence; D018433:Twin Studies as Topic / Q000266:history*; D014430:Twins, Monozygotic