👤

Heck, William Harry

b. 1879 – d. 1919 · 3 books

Books by Heck, William Harry

A study of school recesses
A study of school recesses
1917
... The health of school child
... The health of school children [I]-II
1915
Studies of mental fatigue in relation to the daily school program
Studies of mental fatigue in relation to the daily school program
1914