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The Northeastern Luzon languages is a primary subgroup of the Northern Luzon languages, proposed by Robinson & Lobel (2013) based on historical phonology, functors, and lexicon.
Classification
Robinson & Lobel (2013:148) propose the following internal subgrouping for the Northeastern Luzon languages.
Robinson, Laura C. and Jason William Lobel (2013). "The Northeastern Luzon Subgroup of Philippine Languages." Oceanic Linguistics 52.1 (2013): 125-168. JSTOR43286764.