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Show iS8o] AUTHORITIES 275 Coast ( 2 vols., 1884), History of Oregon ( 2 vols., 1886- 1888), and Arizona and New Mexico ( 1889). Francis Parkman, Oregon Trail ( 1872), is a fascinating account of the life along that route, and is fairly accurate. TIMBER AND AGRICULTURAL PRODUCTS As general descriptive works on the flora of the continent, the following are recommended: C. S. Sargent, The Silva of North America ( 14 vols., 1891- 1902); E. Bruncken, North American Forests and Forestry ( 1900); N. L. Britton and A. Brown, Illustrated Flora of the Northern United States and Canada ( 3 vols., 1896); J. K. Small, Flora of the Southeastern United States ( 1903). These are all authoritative. On the economic relations and value of the various agricultural products the publications of the United States Department of Agriculture are the best sources of information. The Year- Book of the department, published annually since 1894, contains much condensed statistical information. The department also publishes special monographic studies from time to time, of which the following are notable: The Cotton- Plant ( 1896); C. Mohr, The Timber Pines of the Southern United States ( 1897); V. M. Spalding and B. E. Fernow, The White Pine ( 1899); H- W. Wiley, The Sugar- Beet ( 1899). ANIMAL LIPB On the distribution of the fauna, the two chief authorities are J. A. Allen and C. H. Merriam. The most important of their papers are: J. A. Allen, " The Geographical Distribution of North American Animals" ( American Museum Natural History, Bulletin, 1892); C. H. Merriam, " The Geographic Distribution of Life in North America" ( Biological Society, Proceedings, Washington, 1892); C. H. Merriam, " Laws of Temperature Control of the Geographic Distribution of Terrestrial Animals and Plants" ( National Geographical Magazine, IV., 1894); J. A. Allen, |