South Moluccas : rebellious province or occupied state / by J.C. Bouman, C.E.L. Helfrich, N.J.C.M. Kappeyne van de Coppello ... [et al.] strategic position of the Republic of the South-Moluccas / by C.E.L. Helfrich militair-strategische positie van de Republiek Zuid-Molukken / door C.E.L. Helfrich
