Koch, Helen Lois, 1895–
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- pdbooks.info ID: 107736
Helen Lois Koch Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
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| A study of the test-performance of American, Mexican, and Negro children | 1926 | Author | |  | | | | ||
| Texas educational survey report ... Texas educational survey commission. | 1924 | Author | |  | |  | | 
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