I first saw Watkins' work at an exhibit in D.C. I truly like his nature photography. After being jazzed from his "old school" exhibit, I was given as a gift the book Carleton Watkins: The Art of Perception. I've really enjoyed it. I have a few small prints of his works hanging up at home. They are all black and white, naturally. A good web site to check out has his works from Yosemite. Here are some images of his works: