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History of Chinese society, Liao (907-1125) / Karl A. Wittfogel and Fêng Chia-Shêng ; with the assistance of John De Francis...[et al.].
- American Philosophical Society,
- 1949.
- Philadelphia, PA :
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Symposium on aging of rubbers : Chicago spring meeting American society for testing materials, March 2, 1949 / [contrib. by A.M. Neal...et al.].
- 873
- American Society for Testing Materials,
- 1949.
- Philadelphia, PA :