Numerous scholars have asked about the raw data on which Thomas and Janet Headland based their study on the Agta, a hunter-gatherer population in the Philippines.
Now, those data are published with the full permission of the Agta people. View Agta Demographic Database: chronicle of a hunter-gatherer community in transition 23 pages
The study being referenced is the 1998 publication of Population Dynamics of a Philippine Rain Forest People.
Computer scientist Ray Uehara has worked with the Headlands to compile this database. This database consists of the records of 4,300 Agta individuals, 600 of whom are alive today. Of these, 284 are members of the San Ildefonso Agta, a subpopulation living on a peninsula separate from the larger Casiguran Agta Population on the mainland. Included in these records are the names, facial photographs, family histories, genealogies, and ancestors (dating back to the late nineteenth century) of today’s Agta. The data are complete with every birth, marriage, divorce, death, and in- and out-migration since 1950 to January 2010, for the 284-member San Ildefonso Agta subpopulation.
The International Museum of Cultures maintains a Philippine Agta exhibit. Please come visit us and learn more about the rich heritage of these people.
Read the SIL Language and Culture Documentation and Description 2 for more information about the authors of the reports referenced above.