Below is an excerpt from a MARC record, the fields of interest are the author listed in field 100 and the contributor listed in the second 700 field. The names are the same, the birth date, highlighted, is wrong in field 100 and correct in field 700. I can write code to catch this kind of error and correct it, but I don't think the same person will be listed as author and contributor very often.

100 $aKnickerbocker, H. R.$q(Hubert Renfro),$d1998-1949.
245 10 $aWill war come in Europe? /$cby H.R. Knickerbocker ; with an introduction by J.W. Wheeler-Bennett.
260    $aLondon :$bJohn Lane,$c1934.
300    $axiv, 276 p. ;$c19 cm.
500    $aAmerican edition (New York, Farrar and Rinehart, incorporated) has title: The boiling point; will war come in Europe?
651  0 $aEurope$xPolitics and government$y1918-1945.
651  0 $aGermany$xPolitics and government$y1933-1945.
651  0 $aEurope$xKings and rulers.
700 $aWheeler-Bennett, John Wheeler,$cSir,$d1902-1975.
700 $aKnickerbocker, H. R.$q(Hubert Renfro),$d1898-1949.$tBoiling point will war come in Europe?
740 $aBoiling point, will war come in Europe?

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