| Author | Martin, Maude Cottingham.
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| Title | The United States at work / by Maude Cottingham Martin and Clyde Edwards Cooper.
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| Published | Boston : D.C. Heath, 1938.
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| Description | xiv, 656 p. : ill., maps ; 21 cm. & teacher's manual.
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| General Note | On cover: Heath's correlated social studies.
Includes index.
"The book is an outgrowth of material prepared for classes in Roosevelt junior high school, Cleveland Heights, Ohio."--Pref.
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