This is a list of prominent 20th-century wilderness explorers, naturalists, survival instructors, and exponents of outdoor education, adventure education, adventure therapy, wilderness therapy, etc. 20th-century proponents of outdoor education See also Conservation movement Notable outdoor exponents in the Philippines United States Army Indian Scouts Lists List of 20th-century summiters of Mount Everest List of American guerrillas in the Philippines List of climbers and mountaineers List of Mount Everest summiters by number of times to the summit List of underwater divers Notes and references External links History of Outdoor Education: Introduction History of Outdoor Education Research Historical Timeline of Outdoor Education Historical Development of Outdoor Education Books about Adventure-based Group Activities, Games, Exercises & Initiatives Outdoor Education Bibliographies, Reference Lists, Abstracts, Databases, & Indexes Camp-Related Research Bibliographies Bibliography . . Adventure Outdoor educators Outdoor education Environmental education