Russia, Iraq, and Other Potential Sources of Anthrax, Smallpox and Other Bioterrorist Weapons, Hearing Before the Committee on International Relations, House of Representatives, One Hundred Seventh Congress, First Session, December 5, 2001 [open pdf - 419KB]
From the statement of Richard O. Spertzel: "Although Iraq denied that they had attained any higher than about 10 to the 10th or 10 billion, Iraq also had the capability of drying anthrax. They denied having done it, but their contacts with foreign companies revealed that they looked into obtaining the kind of materials that would be necessary in that process, such as the kind of silica and other types of material that would give those special properties that makes it really airborne. Now, we know from actual evidence in 1994 of a related agent, bacillus thuringiensis, a biopesticide, that they demonstrated their capability of producing a small particle using a spray dryer without milling. In that case, they used Bentonite as the additive." Statements, letters, and materials submitted for the record include those of the following: Kenneth Alibek, Elisa D. Harris, Donald M. Payne, and Earl Blumenauer.
Serial No. 107-56
Government Printing Office, Congressional Hearings: http://www.gpoaccess.gov/chearings/index.html