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Expansion of the known world by selected periods
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afford agricultural amount animals areas artiﬁcial average Bluegrass region Canal cause cent climate coal coast conﬁned considerable Courtesy crops cultivation deﬁnite dense deposits desirable dissected plateau drainage Drainage Basin earth effective elevation environment erosion example extent farm favorable feet ﬁelds ﬁnd ﬁres ﬁrst ﬁsh ﬁshing ﬂat ﬂood ﬂow forest glacial grassland grazing growth handicap highlands Hokkaido important inches increase industry iron irrigation Kentucky lacustrine plain Lake land latitudes less likewise limited man’s material ment miles mineral mountain natural natural environment occur ocean Paciﬁc pedalfers pedocals period plains plant population population density possible precipitation present production proﬁt proﬁtable rainfall region relative humidity result River season slopes soil Soil Conservation Service southern square miles stream surface temperatures tion tropics types United Valley vary vegetation water supply weather winds winter