Southern Mindanao. Referendum on P.D. 1618, creating two autonomous regions, except Palawan, South Cotabato and Davao del Sur.
Source: https://www.officialgazette.gov.ph/1977/03/25/proclamation-no-1628-s-1977/
Southern Mindanao. Referendum on P.D. 1618, creating two autonomous regions, except Palawan, South Cotabato and Davao del Sur.
Source: https://www.officialgazette.gov.ph/1977/03/25/proclamation-no-1628-s-1977/