https://pds-imaging.jpl.nasa.gov/data/mer/spirit/mer2mw_0xxx/catalog/ has
  haz2_mesh_ds.cat
  haz2_wedge_ds.cat
  hazcam_instrument_description.cat
  mer2_pan_inst.cat
  nav2_mesh_ds.cat
  nav2_wedge_ds.cat
  navcam_instrument_description.txt
  pan2_mesh_ds.cat
  pan2_wedge_ds.cat
  person.cat
  ref.cat 
but it doesn't have a voldesc.cat, so I scattered the *ds* to volumes
that had their instrument.