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A notable example are the powerful images of Carleton Watkins which were successfully used to stimulate the establishment of Yosemite National Park in 1864 and William Henry Jackson and Ansel Adams who advocated for expansion and continued funding of the park .
 Carleton Watkins, Yosemite National Park, William Henry Jackson, Ansel Adams
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Carleton Watkins, Yosemite National Park, William Henry Jackson, Ansel Adams