Person
Heck, W. H. (William Harry), 1879-1919
Catalogue
- Books
- Online
A study of mental fatigue in relation to the daily school program / [by] W. H. Heck.
Heck, W. H. (William Harry), 1879-1919.Date: 1913- Books
A study of mental fatigue in relation to the daily school program / W.H. Heck.
Heck, W. H. (William Harry), 1879-1919.Date: 1913- Books
- Online
Mental discipline & educational values / by W.H. Heck.
Heck, W. H. (William Harry), 1879-1919.Date: 1909