Philippines. national Mapping and Resource Information Authority. Surigao. National Mapping and Resource Information Authority, 1974.
Chicago-viite (17. p.)Philippines. national Mapping and Resource Information Authority. Surigao. Makati, Metro Manila: National Mapping and Resource Information Authority, 1974.
MLA-viite (9. p.)Philippines. national Mapping and Resource Information Authority. Surigao. National Mapping and Resource Information Authority, 1974.
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