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In page Legislative district of Agusan:

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Republic Act No. 4979, approved by plebiscite held simultaneously with the 1967 elections, split the old Agusan Province into Agusan del Norte and Agusan del Sur and provided them each with a congressional representative.[4] In accordance with Section 7 of Republic Act No. 4979, the two new provinces first elected their separate representatives starting in the 1969 elections.[4]