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1Published 1929Minneapolis : The University of Minnesota Press, 1929.vi, 274 p., [12] leaves of plates : ill., diagrs. ; 21 cm.“...University of Minnesota. Institute of Child Development and Welfare...”
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2Published 1937London, Minneapolis, H. Milford, Oxford university press; The University of Minnesota Press [c1937]vii, 327 p. front., illus., plates, diagrs. 21 cm.“...University of Minnesota. Institute of Child Development and Welfare...”
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3Published 1927Minneapolis, Minn. : [s.n.], 1927.156 p. ; 24 cm.“...University of Minnesota. Institute of Child Development and Welfare...”
