Bookstore
This link takes you to the Western National Parks Association, which operates bookstores in numerous National Parks. Search for "White Sands" for books and materials relating to White Sands National Monument.
Did You Know? Only the top few inches of the gypsum dunes are made of loose sand. Rainwater falling on the dunes dissolves some of the gypsum and cements the sand grains together, creating a crude form of plaster of Paris. This makes the white sand dunes easy to walk on. more...