TY  - GEN
T1  - Region I
LA  - English
PP  - Makati City
PB  - National Mapping and Resource Information Authority
YR  - 1990
ED  - Ed.1, November, 1989.
UL  - https://tuklas.up.edu.ph/Record/UP-99796217606010087
NO  - Clarke spheroid 1866 Luzon datum
NO  - Elevations in meters above mean sea level
NO  - Revised ed., 1997
NO  - Inset: Location diagram
NO  - Includes: General information
KW  - Ilocos Region : Maps.
ER  -