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one A Growing Enchantment
two Beyond the Forest
three The Kinds of Open Space
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abundant agriculture ancient areas arid Asia Baja California basin Bechtel bison cattle centers century cereal cities climate continental crops cultivation culture desert developed diﬂicult domestic drought dryer early East environment Europe farm favorable fertile ﬁelds ﬁnally ﬁnd ﬁre ﬁrst ﬁsh ﬂood ﬂowering forest forms fossil glaciation glaciers grasses grassland grazing groups growing growth Gulf of California herds horse human hunting Indians Lake Chalco lakes land living maize man’s margins Mexico Mexico City mineral modern moisture Mound Builders mountain Nancy Bechtel natural Neolithic North America northern numbers nutrients open landscape organic pasture plains plants and animals pollen population prairie present primitive production proﬁt rainfall reason region remains rodents sagebrush savanna scientiﬁc scrub sediments shortgrass signiﬁcant soil space species steppe stone supply survive swamp Tenochtitlan thousand years ago tion treeless trees tundra urban vegetation western wheat wild wood woodland woody zones