Philippines. National Mapping & Resource Information Authority. Laoag. National Mapping & Resource Information Authority, 1990.
Cita Chicago Style (17a ed.)Philippines. National Mapping & Resource Information Authority. Laoag. Makati, Metro Manila: National Mapping & Resource Information Authority, 1990.
Cita MLA (9a ed.)Philippines. National Mapping & Resource Information Authority. Laoag. National Mapping & Resource Information Authority, 1990.
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