[Soil survey report] series 1937, 19 and 20. 20. Soil survey, Niagara County, New York [with list of literature cited]; by C. S. Pearson, Wilber Secor, D. F. Kinsman, J. C. Bryant, J. E. Dalrymple, C. B. Lawrence, Herbert Hopper and A. T. Sweet.

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