A very good article by James Kippen (Tabla of Lucknow) entitled "Folk Grooves and Tabla Tal-s" is currently available on .pdf from ECHO: a music-centered journal www.humnet.ucla.edu/echo.
The article may not be archived forever so print a copy for yourself and someone else.
The direct address for the .pdf file is: http://www.echo.ucla.edu/Volume3-Issue1/kippen/tabla_tal-s.pdf
