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1ספריצא לאור 1966"...United States. Congress. Senate. Committee on Commerce..."
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2Government Document ספריצא לאור 1994"...United States. Congress. Senate. Committee on Commerce, Science, and Transportation..."
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3ספריצא לאור 1970"...United States. Congress. Senate. Committee on Commerce. Subcommittee on Oceanography..."
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4Government Document ספריצא לאור 1982"...United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee..."
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5ספריצא לאור 1978"...United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee..."
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6ספריצא לאור 1978"...United States. Congress. Senate. Committee on Commerce, Science, and Transportation..."