June 30, 2013 | Yosemite National Park
"Yosemite Falls is the tallest waterfall in North America, and is a powerful presence in Yosemite Valley. From winter ice to spring flood to autumn dryness, this magnificent waterfall is a dynamic force of nature." Quoted from the video description.
US Topo GeoPDFs
June 9, 2013 | USGS on YouTube
This is a video tutorial that will demonstrate how to use USGS topographic maps in PDF format.
July 14, 2013 | Yosemite National Park
"The granite monolith of Half Dome is recognized throughout the world as an icon of Yosemite National Park. Thousands of visitors hike to the summit each year, rewarded with spectacular views and an experience that is not easily forgotten." Quoted from the Yosemite National Park video description.