U.S. G.P.O. : For sale by the Supt. of Docs., Congressional Sales Office, U.S. G.P.O.,
Preservation of print : hearing before the Subcommittee on Science, Research, and Technology of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred First Congress, first session, May 4, 1989.
United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Science, Research, and Technology.
Preservation of print : hearing before the Subcommittee on Science, Research, and Technology of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred First Congress, first session, May 4, 1989.