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A study of mental fatigue in relation to the daily school program / [by] W. H. Heck.

A study of mental fatigue in relation to the daily school program / W.H. Heck.

Mental discipline & educational values / by W.H. Heck.

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Active filters:

A study of mental fatigue in relation to the daily school program / [by] W. H. Heck.

A study of mental fatigue in relation to the daily school program / W.H. Heck.

Mental discipline & educational values / by W.H. Heck.