Orientation in school health

Xehetasun bibliografikoak
Egile nagusia:	Langton, Clair Van Norman 1895-
Formatua:	Liburua
Hizkuntza:	English
Argitaratua:	New York, London Harper & brothers [c1941].
Gaiak:	School hygiene. Schools > Sanitary affairs. > U.S. Hygiene > Study and teaching.