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Rubber-content of North American plants / by Harvey M. Hall and Frances L. Long.
- 873
- Carnegie institution,
- 1921.
- Washington, DC :
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Hearings before the Committee on ways and means, House of representatives on schedule F : tobacco and manufactures of January 20, 1921
- 873
- Government Printing Office,
- 1921.
- Washington, DC :
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Bolivia : a commercial and industrial handbook / by W.L. Schurz.
- 878.8
- Government Printing Office,
- 1921.
- Washington, DC :