A small discrepancy was found in the 1977 PDF series.
770322R1-MAYAPUR.PDF should be deleted
and replaced by 770322R1-BOMBAY.PDF
770322R1-BOMBAY.PDF from here:
The original AUDIO file name [770322R1-BOMBAY.mp3] is fine.
The VedaBase will reflect this update the next time around.
Sorry for the inconvenience.