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THIS BOOK IS DUE ON THE LAST DATE STAMPED BELOW AN INITIAL FINE OF 25 CENTS WILL BE ASSESSED FOR FAILURE TO RETURN THIS BOOK ON THE DATE DUE. THE PENALTY WILL INCREASE TO 50 CENTS ON THE FOURTH DAY AND TO $1.00 ON THE SEVENTH DAY OVERDUE. SEP9«W 8 MAY '61 tU 0 JAN'62fNr JUN 1 0 1S6S RET, A^-R^l 196^ JUN 1 0 1965 RECELVEi: APR ^W AUG a 1 1984 • BRARY Book Slip-15m-8,'52(A2573s4)458 / B!ZMa ^.^. PHYSICAL SCIENCES LIBRARY ^905. S45 v^ COi CTlf of 87" ^S LIBRARY imiVERSITY OF CALIFCmmil DAVIS. 