Unobtrusive measures : nonreactive research in the social sciences /
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| Main Author: | |
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| Format: | Book |
| Language: | English |
| Published: |
Chicago :
Rand McNally College publ Co.,
c1966.
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| Subjects: | |
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| Physical Description: | xii, 225 p. |
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| Bibliography: | Includes bibliographical references and index. |