 This he published in "Borneo Shimbun", including the entirety of the proclamation, the constitution, and an announcement of Pangeran Muhammad Noor's selection as governor.He also helped establish branches of the National Party of Indonesia, People's Security Body, and governing boards.After the Dutch–Indonesian Round Table Conference in 1949 Hamidhan renamed "Soeara Kalimantan" as "Indonesia Merdeka".