@book{9789,
	author = {Balicao, Narly D. },
	title = {Nitrate level analysis of the groundwater in cropped lands in San Marcelino, Dingras, Ilocos Norte},
	year = {2008},
	note = {Thesis (BS Environmental Science) -- Mariano Marcos State University-College of Agriculture, Food and Sustainable Development, Batac City  }
}