Fourth International Congress on School Hygiene

Fourth International Congress on School Hygiene

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3, 657 Head Lice . ... diagrams. show. the. number. and. percentage. of children defective at each age period from 6 to 16 inclusive:* Age Normals Percentage Defectives Percentage 6 9, 028 2.9 24, 957 8.2 7 7, 057 2.3 26, 122 8.6 8 6, 591 2.2 anbsp;...


Title:Fourth International Congress on School Hygiene
Author:
Publisher: - 1914
ISBN-13:

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