Look for the INDEX.TAB and CUMINDEX.TAB on the pds volumes to figure out what files to use at any time.

Here's an interesting time:
"VGPW_1011","VG1P02C1689523",1979-081T08:51:56.254Z,"02/16895.23","DATA/WFRM/P2/V11102/C1689523.LBL",2000-12-08
