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Books about Valmayor:
Comparative study of ozone and MnO"2/O"3 effects on the elimination of TOC and COD of raw water at the Valmayor... by M.A. Alsheyab and A.H. Munoz (Mar 10, 2007)
The Complete Writings of Dr. Eduardo A. Quisumbing on Philippine Orchids, edited and with an introduction by H.L... (1981)