A production of The Documentary Guild in association with WGBH Boston for Nova ; WGBH Educational Foundation ; Executive editor, William Grant ; executive producer, Paula S. Apsell ; written, produced and directed by Rob Whittlesey and Noel Buckner
written by Stephen Lyons & Llewellyn M. Smith ; directed by Llewellyn M. Smith ; produced by Llewellyn M. Smith, Stephen Lyons ; a Nova production for WGBH Boston ; WGBH Educational Foundation
written and produced by Martin Williams ; directed by Lara Acaster, Alex Williams ; produced for Nova by Joseph McMaster ; a Pioneer Productions film for Nova/WGBH and Channel 4 ; WGBH Educational Foundation
a Nova production by Hamilton Land & Cattle, Inc. for WGBH-Boston ; WGBH Educational Foundation ; Written and produced by Doug Hamilton ; associate producer: Solana Pyne
produced by Mary Olive Smith and Steven Engel ; directed by Mary Olive Smith and Amy Bucher ; an Engel Entertainment production in association with Nova
written, produced and directed by Linda Garmon ; a Nova production by the WGBH/Boston Science Unit in association with BBC-TV, NDR International Hamburg and Nederlandse Omroepprogramma Stichting
produced by Swedish Television in association with WGBH Boston ; directors and producers, Bo G. Erikson, Carl O. Lofman ; for NOVA, written and produced by Bebe Nixon
writer and producer, Neil Goodwin ; a Peace River Films production for The American Experience ; WGBH Educational Foundation, WNET/Thirteen and Peace River Films