found: Hallmark hall of fame. The Borrowers [MP] 1973: credits (produced by Warren L. Lockhart)
found: Grossman, L. Snoopy!!! [SR] 1991?, p1976: container (Warren Lockhart)
found: IMDb, Aug. 11, 2000 (Warren Lockhart; sometimes credited as Warren L. Lockhart)
found: Los Angeles times WWW site, Feb. 6, 2012 (Warren Lockhart; b. Oct. 20, 1940, Los Angeles; d. Jan. 19 [2012], Culver City [Calif.], at 71; film, television, and theater producer)
found: Grossman, L. Snoopy [SR] p1983: insert (book by Warren Lockhart)