W. J UNK 



VERLAGu.BUCHHANDL. 

 NATURWISS.U.MATHEMA1 



BERLIN N.W.5_ 



7 



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California Academy of 

 Sciences Library 



By action of the Board of Trustees of the 



Leland Stanford Junior University on June 



14, 1974, this book has been placed 



on deposit with the 



California Academy of Sciences Library. 



