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Handbook of Birds of the Western United States, Boston, Houghton, Mifflin and Company, 1902, birds, west us, Woods Hole, A detailed map illustrating various life zones across the western United States, showcasing significant regions such as California, Texas, and the Rocky Mountains. The map delineates different ecological zones including Boreal, Transitional, Upper Sonoran, Lower Sonoran, and Tropical. Each zone is labeled clearly, highlighting the geographical distribution of these ecological areas. Additionally, it features notable states and regions, providing a historical context for the study of environmental conditions and biodiversity in each area. The map serves as an educational resource, reflecting the work of C. Hart Merriam in the exploration of life zones in North America. (Photo by: Sepia Times/Universal Images Group via Getty Images)