Raag Mala is a set of 10 tapes. Each side is about 20 minutes long so that the whole lasts for more that 6 and a half hours!

The set contains an anthology of more than 90 common ragas performed by prominent musicians of the sub-continent belonging to various gharanas.  Each rendition is preceded by a brief description of its characteristics. The set was jointly produced by EMI Pakistan and PNCA. I bought the set from Shrimatis of California:

Tape Search at Shrimatis

If you type raag mala in the search area and submit query, you will be presented with the web page about this set.

Later, Irfan Anwar kindly sent me the CD version of the whole set. The following low-res mp3 files are based on the CDs.