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Arg. Saesneg gwreiddiol = Original English ed.: Oxford: Oxford University Press, 1996.
Yn cynnwys mynegai = Includes index.
Addasiad Cymraeg gan = Welsh adaptation by: John Emyr.
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Unol Daleithiau America 1917-1980 by Nigel Smith. ISBN 189881788X. Published by Prifysgol Cymru, Bangor in 1998. Publication and catalogue information, links to buy online and reader comments.