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TWINS
A STUDY OF HEREDITY AND
ENVIRONMENT
THE UNIVERSITY OF CHICAGO PRESS, CHICAGO
THE BAKER & TAYLOR COMPANY, NEW YORK; THE CAMBRIDGE
UNIVERSITY
PRESS, LONDON; THE MARUZKN-KABUSIIIKI-KAISHA, TOKYO,
OSAKA,
KYOTO, FUKUOKA, SENDAI', THE COMMERCIAL PRESS, LIMITED,
SHANGHAI
TWINS
A STUDY OF HEREDITY AND
ENVIRONMENT
By
HORATIO H. NEWMAN
FRANK N. FREEMAN
KARL J. HOLZINGER
THE UNIVERSITY OF CHICAGO PRESS
CHICAGO ILLINOIS
COPYRIGHT 1937 BY THE UNIVERSITY OF CHICAGO. ALL RIGHTS
RESERVED. PUBLISHED MAY 1937. COMPOSED AND PRINTED BY
THE UNIVERSITY OF CHICAGO PRESS, CHICAGO, ILLINOIS,
U.S.A.
PREFACE
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