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Hayasaka, I. (1943). On the Jurassic formation of the Philippines: with a note on Trigonia. Taiwan Geological Notes (Taiwan Tigaku Kizi). 14: 3-12.
Hayasaka, I. (1943). On the Jurassic formation of the Philippines: with a note on Trigonia. Taiwan Geological Notes (Taiwan Tigaku Kizi). 14: 3-12.
