|April 11, 1926
||military expeditions from 1907 up to 1922
On early expeditions see: “First contact, in the highlands of Irian Jaya” by Anton Ploeg (Journal of Pacific History 30:227-239, 1995); and West Irian: a bibliography by J. Van Baal, K.W. Galis and R.M. Koentjaraningrat (Dordrecht-Holland; Connaminson; U.S.A.: Foris Publications, 1984) pp 44-48.