共 10 条
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- [3] Hall, COMMUNICATION
- [4] NERLOVE, 1956, J FARM EC MAY, P496
- [5] *US BUR CENS, 1957, STAT ABSTR US
- [6] US Department of Defense, 1956, FED RANG COD, P2
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- [10] WELSH TA, COMMUNICATION, P63303