Assamese literature its roots in the Eastern dialect. The modern Assamese period began with the publication of the Bible in Assamese prose by the American Baptist missionaries in 1819. The currently prevalent standard Asamiya has its roots in the Sibsagar dialect of Eastern Assam. As mentioned in Bani Kanta Kakati's "Assamese, its Formation and Development" (1941, Published by Sree Khagendra Narayan Dutta Baruah, LBS Publications, G.N. Bordoloi Road, Gauhati-1, Assam, India) – " The Missionaries made Sibsagar in Eastern Assam the centre of their activities and used the dialect of Sibsagar for their literary purposes". The American Baptist Missionaries were the first
Assamese language not have a vowel length distinction, but have a wide set of back rounded vowels. In the case of Assamese, there are four back rounded vowels that contrast phonemically, as demonstrated by the minimal set: "kôla" ('deaf'), "kola" ('black'), "kûla" ('lap'), and "kula" ('winnowing fan'). The near-close near-back rounded vowel is unique in this branch of the language family. But in lower Assam, ও is pronounced same as অ' (o') which is also correct. "kola" "mor" Modern Assamese uses the Assamese script, and in the medieval times the script came in four varieties: "Bamuniya", "Garhgaya," "Kaitheli" and "Lakhari", which developed