Northern Bontoc [rbk] is listed in E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27/E28 as a separate language from Central Bontoc [lbk]. While there are differences, Northern and Central Bontoc are mutually intelligible ( Macabuhay, Perry and Goschnick, Hella E. 1979: 86 , Reid, Lawrence A. 1976 :v). See also: Central Bontoc [lbk].
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Glottolog