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William Harry Heck

4 cilt bulundu.

Cilt sonuçları

Studies of mental fatigue in relation to the daily school program

Studies of mental fatigue in relation to the daily school program

Heck, William Harry · J. P. Bell company, incorporated, printers

38 sayfa · 1914

Mental fatigue

A study of school recesses

A study of school recesses

Heck, William Harry · The University

22 sayfa · 1917

Kategori yok

EducationMental discipline and educational valuesWilliam Harry Heck

Mental discipline and educational values

William Harry Heck · J. Lane

208 sayfa · 1912

Mental discipline / Education

School hygiene... The health of school children [I]-IIHeck, William Harry

... The health of school children [I]-II

Heck, William Harry · Govt. print. off.

Sayfa sayısı yok · 1915

School hygiene