http://oldwww.wii.gov.in/nwd_birds/jal.htm
Key to the Checklist - In the column titled field_status, R = widespread resident r = very local resident V = vagrant W = widespread winter visitor w = sparse winter visitor ? = status uncertain rl = introduced resident P = widespread migrant p = sparse migrant (ex)= extinct nT = near threatened E = endangered
Checklist Stats - Number of species: 52
Author quoted references for the checklist - Kumar, S. Ashok, 1998. Birds of Jaldapara Wildlife Sanctuary. Newsletter for Birdwatcher Vol.38(1&2) 7.
For more on Jaldapara Wildlife Sanctuary: http://en.wikipedia.org/wiki/Jaldapara_Wildlife_Sanctuary