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
History of Assamese literature "Grammatical notes of the Assamese Language" first published in 1848 originally was not intended to be regarded as a grammar of the Assamese language but “they were commenced with the intention of printing only a few sheets, for private use of the most common grammatical forms.” However this book soon served as the first Assamese grammar book. He wrote books on elementary arithmetic and geography which were much superior to Bengali books used in schools at that time. In this he was assisted by his wife Eliza, who was a translator in her own right. Brown was also a pioneer