DENR ADMINISTRATIVE ORDER NO. 2006-18, December 29, 2006
DESIGNATION OF THE TIGUM-AGANAN WATERSHED AS WATER QUALITY MANAGEMENT AREA AND CREATION OF ITS GOVERNING BOARD
National Administrative Register December 29, 2006
(Text Available at Office of the National Administrative Register, U.P. Law Complex, Diliman, Quezon City )
Adopted: 29 Dec. 2006