|資料類型：||文獻, 政府刊物, 國家級的政府刊物, 網際網路資源|
|所有的作者/貢獻者：||United States. Federal Bureau of Investigation.|
|注意：||Title from title screen (viewed on July 24, 2008).
|描述：|| p. : digital, PDF file|
|詳述：||Mode of access: Internet from Federal Bureau of Investigation web site. Address as of 7/24/08: http://foia.fbi.gov/foiaindex/sagan_c.htm; current access available via PURL.|
|責任：||Federal Bureau of Investigation.|
Dr. Carl Sagan on November 15, 1983, received a letter addressed to him at the Space Science Building, Cornell University, Ithaca, NY. The letter spun stories of possible terrorist happenings. The communiqué was signed "M. Springfield." A pretext call was made to M. Springfield who was located in the telephone directory. The call revealed that M. Springfield died in 1972, and his widow now resides at the address. She had no knowledge of the letter sent to Dr. Sagan.