(1968). Smithsonian Research Opportunities. Smithson. Inst.
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Dyfyniad Arddull Chicago
Smithsonian Research Opportunities. Washington: Smithson. Inst, 1968.
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Dyfyniad MLA
Smithsonian Research Opportunities. Smithson. Inst, 1968.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.