This directory contains a cumulative index table (CUM_INDX.TAB) which describes
the location of all files on the PV04 collection (PVO-ORSE). In
addition, there is a file (INDEX.TAB) which gives the name and
location of all files on this volume. These index files have been
provided for users who do not wish to make use of the DITDOS
software.

    key files:
        CUM_INDX.TAB - contains a cumulative index for the PV04 volume set.
        CUM_INDX.LBL - describes the columns and format of CUM_INDX.TAB
        INDEX.TAB - contains an index of this volume (PV04_0031)
        INDEX.LBL - describes the columns and format of INDEX.TAB