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Nti Ngơi Nau Bu Nong (Central Mnong Language Lessons) came to us from one of my evening students who came to the US with her husband and family from Vietnam via Cambodia in 1992. Another student also said she had kept her copy from the refugee camp, too. The text reflects some of the interests of the people of the time which today we would regard with amusement. In fact, it preserves some of the lifestyle (hunting with crossbows, cooking rat) that the American and later wars and upheavals destroyed.
From the Summer Institute of Linguistics (see http://www.sil.org/). Originally published in 1974 and republished in 1978.
There is a good brief overview in Vietnamese and English and an interesting list of Summer publications at the end of the booklet.
Mnong or Bu Nong (or Bunong)? All the speakers in our classes referred to themselves as Bunong.