The emerging evidence for the Keram family is summarized in Russell Barlow 2020: 14-17 Barlow, Russell 2023: 24-28 . Ap Ma/Botin/Kambot shows some typological similarities to the Grass, Banaro and Ramu languages but there is little lexical evidence John A. Z'graggen 1969: 168-169 William A. Foley 2018 Joseph Daniel Brooks 2018: 70 . Similarly, Ambakich [aew] has too little evidence to be included in the Ramu family at the present state of documentation Joseph Daniel Brooks 2018: 70 . A Keram-Ramu family has been posited but not yet substantiated Barlow, Russell 2023: 24-31 .
Russell Barlow 2020: 14-17 Barlow, Russell 2023: 24-28
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Glottolog