 His report, published in 1959, was based on artifacts and information derived from 505 graves in two sites known as Kay Tomas and Pulong Bakaw.In the 1960s, by then the head of the Anthropology Division of the National Museum of the Philippines, he led a six-year archaeological research project in Palawan, focusing mainly on the caves and rockshelters of Lipuun Point in the southern part of the island (Fox 1970).Its most outstanding site is the Tabon Cave complex, the large main cave delivered the only Pleistocene human fossils found in the Philippines to date.