00555nam a22001457a 4500003000400000005001700004008004100021040001400062100002100076245011000097260000900207300002700216500014000243504002600383OSt20171010095615.0130130t        xxu||||| |||| 00| 0 eng d  aMMSUcULS  aRamos, Jesus N.   aIncidence of lead in Cerithiidae sp. in Gaang river (downstream) Currimao, Ilocos Norte cRamos, Jesus N.  c2004  axi, 27 leaves c28 cm.  aThesis (BS Environmental Science) -- Mariano Marcos State University-College of Agriculture, Food & Sustainable Development-Batac City   aBibliography: leaf 17