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1كتابمنشور في 1966"…United States. Congress. Senate. Committee on Commerce…"
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2وثيقة رسمية كتابمنشور في 1994"…United States. Congress. Senate. Committee on Commerce, Science, and Transportation…"
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3كتابمنشور في 1970"…United States. Congress. Senate. Committee on Commerce. Subcommittee on Oceanography…"
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4وثيقة رسمية كتابمنشور في 1982"…United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee…"
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5كتابمنشور في 1978"…United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee…"
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6كتابمنشور في 1978"…United States. Congress. Senate. Committee on Commerce, Science, and Transportation…"