Fifty-two years after Caldecott's death, Frederic G. Melcher (dunno) established the Caldecott Medal. It was first awarded in 1938, going to the "most distinguished picture book by an American artist published during the preceding year," The first winner was Dorothy P. Lathrop's Animals of the Bible. Randolph's own books have all gone out of print, except for one.
Books:
Ride a Cock Horse
thanks to:
http://www.speel.demon.co.uk/artists2/caldecot.htm
http://macserver.stjohns.k12.fl.us/others/rc.html
http://avatar.lib.usm.edu/~degrum/findaids/caldecot.htm
www.amazon.com