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