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International cooperation in Earth observing systems hearing before the Subcommittee on International Scientific Cooperations and the Subcommittee on Space Science and Applications of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred First Congress, second session, July 24, 1990
- "International cooperation in Earth observing systems hearing before the Subcommittee on International Scientific Cooperations and the Subcommittee on Space Science and Applications of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred First Congress, second session, July 24, 1990"@en
- "International cooperation in Earth observing systems : hearing before the Subcommittee on International Scientific Cooperations and the Subcommittee on Space Science and Applications of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred First Congress, second session, July 24, 1990"@en