ssp

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Across
  1. 2. (Indigenous)
  2. 7. (Man – Palawan fossil)
  3. 9. ("Civilized")
  4. 12. (Southern Philippine Development Authority)
  5. 13. (Office for Northern Cultural Communities)
  6. 15. (Baguio City native)
  7. 17. (Philippine non-indigenous religion)
  8. 19. (Office for ICCs/IPs)
  9. 21. (Negrito)
  10. 23. (Northern Luzon province for non-Christians – Mountain Province)
  11. 27. (Slash-and-burn farming)
  12. 28. (Community)
  13. 29. A few clues—especially 7 Across, 14 Across, and 17 Across—can vary depending on the exact number of boxes in the crossword. If you upload the crossword grid, I can place every answer into the correct boxes and resolve any ambiguous entries.
Down
  1. 1. (Bureau of Non-Christian Tribes)
  2. 3. (Mountain dweller)
  3. 4. ("Infieles")
  4. 5. (Islam devotee of Spanish Philippines)
  5. 6. (Relating to a cultural group)
  6. 8. (An indigenous religion)
  7. 9. (Man – Cagayan fossil)
  8. 10. (Indonesian native)
  9. 11. (Mindanao indigenous peoples)
  10. 14. (Kalanguya)
  11. 15. (Kankana-ey native; often hyphenated with Kankana-ey in ethnolinguistic references)
  12. 16. ("Within")
  13. 18. (Rice farming)
  14. 20. ("Non-Christian")
  15. 22. (Spanish Philippines native)
  16. 24. (Differentiated small ethnic group)
  17. 25. (Origin of Philippine Malayo-Polynesians)
  18. 26. (Original)