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U.S. Department of Agriculture. Weather Bureau. The Climatology and Physical Features of Maryland. First Biennal Report of the Maryland State Weather Service for the Years 1892 and 1893 (by William B. Clark).

William Bullock Clark

出版	Press of the Friedenwald Cy, 1894
URL	http://books.google.com.hk/books?id=XmxLygAACAAJ&hl=&source=gbs_api