Indian Amateur Astronomer R. G. Chandra: A unique AAVSO member
  In this Note, which is a sequel on the Indian amateur astronomer R.G. Chandra [Biswas2011a, Biswas2011b], we have presented some documents to reveal his three-decades relationship with the American Association for Variable Stars Observers and other connection to American astronomical societies. We have given a short account of his observations on different category, viz. (i) Variable stars, (ii) Nova, (iii) Meteors and (iv) Andromedae. His responsibilities and recognitions are also discussed. 
Sudhindra Nath Biswas, Saibal Ray and Utpal Mukhopadhyay
physics.hist-ph