Leaves often turn brilliant colors in autumn. One of those colors has generated a lot of heated debate among scientists in recent years. Autumn is a big time for trees. Many shed their leaves, and of ...
Lynes, Barbara Buhler, "Georgia O'Keeffe: catalogue raisonne," New Haven: Yale University Press, with the National Gallery of Art and the Georgia O'Keeffe Foundation, 1999, no. 475.