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1গ্রন্থপ্রকাশিত 1966“…United States. Congress. Senate. Committee on Commerce…”
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2সরকারি নথিপত্র গ্রন্থপ্রকাশিত 1994“…United States. Congress. Senate. Committee on Commerce, Science, and Transportation…”
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3গ্রন্থপ্রকাশিত 1970“…United States. Congress. Senate. Committee on Commerce. Subcommittee on Oceanography…”
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4সরকারি নথিপত্র গ্রন্থপ্রকাশিত 1982“…United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee…”
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5গ্রন্থপ্রকাশিত 1978“…United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee…”
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6গ্রন্থপ্রকাশিত 1978“…United States. Congress. Senate. Committee on Commerce, Science, and Transportation…”