Question: Which documentary, Crumb or Cancer, was produced first?

Context articles: Cancer Wars
Crumb (film)
Nell Gwynne (operetta)
Shigofumi: Letters from the Departed
Cancer (film)
Power Rangers
The New Adventures of Black Beauty
R. Crumb and his Cheap Suit Serenaders No. 2
Child's Play 3
Roundaboutness

Cancer Wars was a six-part documentary that aired on PBS in May 25, 1998.
 The first episode discussed the history of cancer research such as contributions of epidemiologists at the University of Jena which were the first to document the link between cancer and smoking.
 The documentary discusses how US government tobacco interests prevented this evidence from coming to surface since tobacco was such an important US export.
 Cancer Wars delved into the pioneering work of Rachel Carson, whose book "Silent Spring" radically changed the world's thinking about chemicals and their effects on human health and the environment.
 Other episodes in this series discussed various topics ranging from the history of the advances in cancer therapy to the influence of Margaret Thatcher's neoliberal policies which cut funding to Anti-smoking campaigns in Britain because of interests in protecting British tobacco companies.
Crumb is a 1994 documentary film about the noted underground cartoonist Robert Crumb (R. Crumb) and his family.
 Directed by Terry Zwigoff and produced by Lynn O'Donnell, it won widespread acclaim.
 It was released in the USA on April 28, 1995, having been screened at film festivals the previous year.
 Jeffery M. Anderson (later critic for the "San Francisco Examiner") placed the film on his list of the ten greatest films of all time, labeling it "the greatest documentary ever made."
Nell Gwynne is a three-act comic opera composed by Robert Planquette, with a libretto by H. B. Farnie.
 The libretto is based on the play "Rochester" by William Thomas Moncrieff.
 The piece was a rare instance of an opera by a French composer being produced first in London.
 Farnie had written an earlier libretto on the same subject, with the same name, for composer Alfred Cellier, which was produced at the Prince's Theatre in Manchester in 1876.
Shigofumi: Letters from the Departed, titled Shigofumi: Stories of Last Letter (シゴフミ ～Stories of Last Letter～ ) in Japan, or simply Shigofumi, is a Japanese anime television series created by Tomorō Yuzawa and produced by Bandai Visual and Genco, which aired in Japan on Chiba TV and other networks between January 6 and March 22, 2008 and contains twelve episodes.
 An original video animation episodes was included with the final anime DVD volume released on September 26, 2008.
 A light novel series was originally adapted from the anime's premise set by Tomorō Yuzawa, featuring story composition and illustrations by Ryō Amamiya and Poko, respectively.
 Four novels were published by MediaWorks under their "Dengeki Bunko" imprint between October 2006 and March 2008.
 Despite the novels being produced first, the anime is considered the original work, as stated by Yuzawa.
 The anime has been acquired by Bandai Visual for English language localization.
 The title "Shigofumi" comes from the combination of the Japanese words for "after death" (死後 , shigo ) , and "letter" (文 , fumi ) , which literally translates to an "after death letter".
Cancer: The Emperor of All Maladies is a 2015 American documentary film directed by Barak Goodman and produced by Ken Burns.
 The film, in three-episodes of two hours each, is based on the Pulitzer Prize winning 2010 book, "", by Siddhartha Mukherjee, and describes the history of cancer, and cancer treatments, particularly in the United States.
Power Rangers is an American entertainment and merchandising franchise built around a live action superhero television series.
 Produced first by Saban Entertainment, later by BVS Entertainment, and today by SCG Power Rangers, the television series takes much of its footage from the Japanese tokusatsu "Super Sentai", produced by Toei Company.
 The first "Power Rangers" entry, "Mighty Morphin Power Rangers", debuted on August 28, 1993, and helped launch the Fox Kids programming block of the 1990s, during which it catapulted into popular culture along with a line of action figures and other toys by Bandai.
 s of 2001 , the media franchise has generated over $6 billion in retail sales worldwide.
The New Adventures of Black Beauty was a television drama series produced in the early 1990s.
 The show was produced first in New Zealand, then in Australia.
 The two different productions had different characters and plotlines, un-related except through the horse, Black Beauty.
R. Crumb and his Cheap Suit Serenaders Number 2 is the second 33⅓ rpm album by the retro string band R. Crumb & His Cheap Suit Serenaders and its subtitle was "Persian Rug, Crying My Blues Away, Moana March and Other Favorites".
 The album was later retitled Chasin' Rainbows in re-release on CD (Shanachie 6002, 1993 - ASIN: B000000DSO) from Shanachie Records.
 The band's personnel includes Robert Crumb on lead vocal and banjo, Allan Dodge on mandolin, violin, ukulele and vocals, Robert Armstrong on guitars, accordion, banjo, musical saw and vocals, Terry Zwigoff, who later produced the documentary "Crumb", on cello.
 Originally released on Blue Goose Records in 1976, this record became a collectible not only for the whimsical string band renditions of and reminiscent of the early 20th century music, but for the cover art drawn by the band's frontman and well-known comics artist Robert Crumb.
Child's Play 3 is a 1991 American supernatural slasher film.
 It is the third installment in the "Child's Play" series.
 The film is written by Don Mancini, and directed by Jack Bender, with Brad Dourif returning as the voice of Chucky.
 Although released only one year later, the story takes place eight years following the events of 1990's "Child's Play 2".
 It was executive produced by David Kirschner who produced first two "Child's Play" films.
Roundaboutness, or roundabout methods of production, is the process whereby capital goods are produced first and then, with the help of the capital goods, the desired consumer goods are produced.