As long as you credit each photo to backpackthesierra.com and note that they are copyrighted, you can use them for your report on Yosemite campgrounds. Please don't use them for other purposed without checking with us first.
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Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963