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100   $a19990530g19679999km-y0itay50------ba
101 0 $aeng
102   $aUS
105   $ay-------001yy
200 1 $aAlfonso X, El Sabio$fby John Esten Keller
210   $aNew York$cTwayne Publishers$dc1967
215   $a198 p.$d22 cm
225 1 $aTwayne world authors series$v12
700  1$aKeller,$bJohn Esten$0155789
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