Between 1958 and 1963 the bibliography was first published as a quarterly and then cumulated annually. Since 1964 it is being published every month and the cumulated every year. But the regularity of the publication has suffered in between for various reasons. There are no publication of INB for the period of 1968, 1969 and 1970. For the period of 1994 to 1999, only annual volumes are being published. 1994, 1995,1996 and 1997 annual volumes and 1998-1999 cumulative volume are available for sale. Annual volumes of 2000-2015 are available for sale. From June 2000 onwards, all the monthly issues of INB are being published regularly and are available for subscription.