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About 12 people die each year within Grand Canyon National Park. Avoid being one of them during your summer adventures with How Not to Die at Grand Canyon, a first-aid pocket guide written by Thomas M. Myers, M.D., and published by Grand Canyon Conservancy ($6.95). Myers has been a physician at Grand Canyon Clinic since 1990 and outlines prevention and first-aid tips for the natural wonder’s top 12 hazards, from heat illness to rattlesnake bites....