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. 1919 Dec 15;13(1-3):75–87.

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Some Problems at the Work Age Level

G G Ide, Ph.D.

¹University of Pennsylvania

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¹

¹University of Pennsylvania

Copyright, 1919, by Lightner Witmer, Editor.

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License, which permits non-commercial use and redistribution provided that the original author and source are credited.

PMC Copyright notice

PMCID: PMC5076239 PMID: 28909261

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