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*[https://archive.org/details/assamdistrictga00allegoog ''Assam District Gazetteers''. Published 1905-1928, Volume Volumes 1-10: The Khasi and Jaintia Hills, the Garo Hills and the Lushai Hills''] by B .C . Allen CS 1906 Archive.org, 1905-06; Volume 11 written anonymously, 1928. There are additional Supplementary volumes in this series available on the [[Online books#Digital Library of India| Digital Library of India]] websitepublished c 1915. :There is a download available as a pdf file from [[Online books#Pahar-Mountains of Central Asia Digital Dataset|Pahar-Mountains of Central Asia Digital Dataset]] catalogued as ''1905 Assam District Gazetteers Vols 1 To 10'', located under Books, Indian Subcontinent, 1905. :The following are mainly pdf downloads, Digital Library of India: [http://dli.serc.iisc.ernet.in/handle/2015/463827 ''Cachar Vol. 1''] 1905; [http://dli.serc.iisc.ernet.in/handle/2015/17352 ''Sylhet Vol. 2''] 1905, [http://dli.serc.iisc.ernet.in/handle/2015/463803 ''Sylhet Supplement''] 1915; [http://dli.serc.iisc.ernet.in/handle/2015/55772 ''Supplement to Goalpara''] 1914; [http://dli.serc.iisc.ernet.in/handle/2015/463813 ''Kamrup Vol. 4''] 1905; [http://dli.serc.iisc.ernet.in/handle/2015/463808 ''Darrang Vol. 5''] 1905, [http://dli.serc.iisc.ernet.in/handle/2015/463805 ''Darrang Supplement''] 1915; [http://dli.serc.iisc.ernet.in/handle/2015/210366 ''Nowgong Vol. 6''] 1903; [http://dli.serc.iisc.ernet.in/handle/2015/206853 ''Sibsagar Vol. 7''] 1906, [http://dli.serc.iisc.ernet.in/handle/2015/55771 ''Sibsagar Supplement''] 1915; [http://dli.serc.iisc.ernet.in/handle/2015/206852 ''Lakhimpur Vol. 8''] 1905, [http://dli.serc.iisc.ernet.in/handle/2015/463809 ''Lakhimpur Supplement''] 1916; [http://dli.serc.iisc.ernet.in/handle/2015/463818 ''Naga Hills And Manipur Vol. 9''] 1905; [https://archive.org/details/assamdistrictga00allegoog ''The Khasi and Jaintia Hills, the Garo Hills and the Lushai Hills Vol.10''] 1906 Archive.org., [http://eap.bl.uk/database/overview_item.a4d?catId=183535;r=8723 ''Volume10 Supplement''] 1915. British Library EAP file (Tiff images, may require a plug-in); [http://dli.serc.iisc.ernet.in/handle/2015/463820 ''Vol.11''] The Sadiya and Balipara Frontier Tract ? 1928.

*[https://archive.org/details/historyofthefron035444mbp ''History of the Frontier Areas Bordering on Assam''] by Sir Robert Reid 1942. Archive.org.*Some sample pages from [http://www.koi-hai.com/Default.aspx?id=477224#forgottenfrontierbygeoffreytyson ''Forgotten Frontier''] by Geoffrey Tyson, first published 1945, may be downloaded as a pdf from the Koi-Hai website. This book may be viewed online on the [[Online books#Digital Library of India| Digital Library of India]] website, barcodes 99999990824822 and 99999990848646.The book is about the escape of refugees from Burma in 1942 and the help provided by the tea planters of Assam in assisting the refugees from north Burma into India.