his grouping. In 1865, Pimentel added Mazatec, Popoloca, Chatino and Chinantec – he also posed a separate group of Pame, Otomi and Mazahua, the beginning of the Oto-Pamean subbranch. Daniel Brinton's classification of 1891 added Matlatzinca and Chichimeca Jonaz to Pimentel's Oto-Pamean group (which wasn't known by that name then), and he reclassified some languages of the previously included languages of the Oaxacan group. In 1920, Walther Lehmann included the Chiapanec–Mangue languages and correctly established the major subgroupings of the Oaxacan group. And in 1926, Schmidt coined the name Otomi–Mangue for a group consisting of the Oto-Pamean languages and Chiapanec–Mangue. The Oto-Pamean group and the Main Oaxacan group were not joined together into one family until Sapir's classification in 1929, where it was included in the Hokan family. From the 1950s on reconstructive work began to be done on individual Oto-Manguean language groups. Proto-Oto-Pamean was reconstructed by Doris Bartholomew, Proto-Zapotecan by Morris Swadesh, Proto-Chiapanec–Mangue by Fernández de Miranda and Weitlaner. The classification by Campbell 1997 was the first to present a unified view of the Oto-Manguean languages. In 1981, William Merrifield published a reconstruction of the kinship terminologies of each of the Oto-Manguean branches and of Proto-Oto-Manguean. Unpublished reconstructions of Proto-Oto-Manguean grammar have also been made by Terrence Kaufman. In spite of the lack of a full published reconstruction of proto-Oto-Manguean, the language family has now been widely accepted by specialists, including Lyle Campbell, Terrence Kaufman, and William Poser. Campbell and Poser writing in 2008 concluded that ""Tlapanec-Subtiaba proved not to belong to 'Hokan' as postulated by Sapir (1925a), but to be a branch of Otomanguean ..."" Nonetheless a few studies have retained the inclusion in Hokan, particularly Joseph Greenberg's widely rejected 1987 classification, as well as its derivative works by Merritt Ruhlen. Writing in 1988, Leonardo Manrique still listed Tlapanec-Mangue as an isolated family. The status of the Amuzgo language as either a part of the Mixtecan group or as forming its own branch from the proto-Oto-Manguean node has been discussed by Longacre, who argued for the latter, but the currently most accepted classification by Campbell (1997) follows Terrence Kaufman in considering Amuzgo to be a branch of Mixtecan. Swadesh (1960) and Rensch included the Huave language as a separate branch within Oto-Manguean, but this inclusion has proved untenable as most of the cognates were loan-words from Zapotec. Huave is now considered an isolate. Longacre (1968) considered Oto-Manguean to