Roberts, John R.Pawley, Andrew2021-12-012021-12-01085883457XPL-A87.101http://hdl.handle.net/1885/253643application/pdf© 1997 John R. Robertshttp://creativecommons.org/licenses/by-sa/4.0Switch-reference in Papua New Guinea: a preliminary survey199710.15144/PL-A87.101 2021-12-01Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)