Gunther 1985, hlm. 32. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
When Schaffner's description was relayed to the FBI command post, agents pointed out that dynamite sticks are typically brown or beige in color; the eight red cylinders were probably road flares. But because they could not be sure of this, intervention could not be recommended. (Himmelsbach & Worcester 1986, hlm. 40–41) Himmelsbach, Ralph P.; Worcester, Thomas K. (1986). Norjak: The Investigation of D. B. Cooper. West Linn, Oregon: Norjak Project. ISBN9780961741501. (Himmelsbach was the FBI's chief investigator on the case until his retirement in 1980; “Norjak” is FBI shorthand for the Cooper hijacking.)
This account is disputed: According to most sources Cooper specified 20-dollar bills, but a few, including FBI chief investigator Ralph Himmelsbach, insist that he asked for "negotiable American currency, denomination not important." (Himmelsbach & Worcester 1986, hlm. 18) Himmelsbach, Ralph P.; Worcester, Thomas K. (1986). Norjak: The Investigation of D. B. Cooper. West Linn, Oregon: Norjak Project. ISBN9780961741501. (Himmelsbach was the FBI's chief investigator on the case until his retirement in 1980; “Norjak” is FBI shorthand for the Cooper hijacking.)
A few accounts claim that Cooper bailed out with only one, primary parachute, citing Earl Cossey, the skydiving school owner who prepared and supplied them, as their source. However, the FBI has always maintained that Cooper jumped with two parachutes, a primary and a reserve. (Gunther 1985, hlm. 50) Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 55. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 68. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 184. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 203. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 40. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 44. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 46. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 136. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 15. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
Gunther 1985, hlm. 50. Gunther, Max (1985). D. B. Cooper: What Really Happened. Chicago: Contemporary Books. ISBN0809251809. (Based on interviews with a woman known as “Clara”, who claimed to have discovered an injured Cooper two days after the hijacking and lived with him until he died a decade later; considered a hoax by the FBI.)
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Curtis, Gene (July 8, 2007). Only in Oklahoma: Skyjacker nabs Tulsa plane in error-filled romp. TulsaWorld.com archive Retrieved March 8, 2011.
