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Sonoran desert tortoise --- Sonoran desert tortoise --- Sonoran desert tortoise --- Endangered species --- Habitat --- Conservation --- Monitoring --- Climatic factors --- Sonoran Desert --- Mojave Desert --- Climate. --- Climate.

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Bird populations --- Desert biology --- Fire ecology --- Sonoran Desert. --- Arizona --- North America

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A group of would-be immigrants follows smuggler Leonardo Cerda in an attempt to cross the desert border between Mexico and the United States. The grueling and desperate trip will mark their lives forever.

American literature --- Border crossing --- Border crossing. --- Immigrants --- Immigrants. --- Voyages and travels --- Voyages and travels. --- North America --- Sonoran Desert

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Sonoran desert tortoise --- Fire ecology --- Biotic communities --- Soil chronosequences --- Effect of fires on. --- Effect of fires on

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Conservation of natural resources --- Natural resources management areas --- Natural resources --- Land use --- Public lands --- Planning. --- Sonoran Desert National Monument (Ariz.) --- Management.