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  1. 1

    Callao Cave reopoens after 3 yrs by Domingo, Leander C.

    Published in Manila Times (2023)
    Article
  2. 2

    DENR moves to protect Callao Cave by Domingo, Leander C.

    Published in Manila Times (2023)
    Article
  3. 3

    Cagayan Cave Art is 3,500 years old by Domingo, Leander C.

    Published in Manila Times (2021)
    Article
  4. 4

    Spelunking in Callao by Marasigan, Jaser Isidro A.

    Published in Manila Bulletin (2002)
    Article

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