See illustrated catalogs of his watercolors by D. F. Hoopes (1971, repr. 1988) and his photographs by G. Hendricks (1972); biographies by L. Goodrich (1933, repr. 1977), W. I. Homer (2002), H. Adams (2005), S. D. Kirkpatrick (2006), and W. S. McFeely (2006); studies by F. Porter (1959), S. Schindler (1967), G. Hendricks (1974), E. Johns (1983, repr. 1991), J. Wilmerding, ed. (1993), H. A. Cooper (1996), K. A. Foster (1998), M. A. Berger (2000), and D. Sewell, ed. (2001); study of his photographs by S. Danly and C. Leibold (1994).
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