found: A treasury of World's Fair art & architecture WWW site, Mar. 28, 2008:Louisiana Purchase Exposition, 1904, Saint Louis, Mo. (Palace of Electricity, Louisiana Purchase Exposition, St. Louis, Mo.; Walker & Kimball, architects)
found: Withey, H.F. Biog. dict. of Am. architects (deceased), c1956:under Walker, C. Howard (in 1899 Mr. Walker, native of Boston, formed a partnership with Thomas R. Kimball, of Omaha, Neb.; Walker & Kimball; office opened in Omaha) under Kimball, Thomas R. (Mr. Kimball was in a brief assoc., 1903-1904, with Mr. Walker in designing buildings for the Louisiana Purchase Exposition in St. Louis)