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200 1 $aBirational geometry of degenerations$eProceedings of the Seminar (SAGS'81) held from June 11 - July 29, 1981 at Harvard University.$fby FRIEDMAN Robert. MORRISON David R.
210   $aBoston [etc.]$cBirkhauser
225 1 $aProgress in mathematics$v29
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996   $aBirational geometry of degenerations$9343935
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