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|Material Type:||Government publication, National government publication|
|All Authors / Contributors:||
James Frederick Rogers; United States. Office of Education.
|Description:||17 pages : charts, tables ; 23 cm.|
|Series Title:||Leaflet (United States. Office of Education), no. 37.|
|Responsibility:||[by James Frederick Rogers, M.D., consultant in hygiene, United States Office of Education].|