postscript fonts question

[Josef Lowder]

.
Someone sent me the following postscript fonts, 
but I can't figure out how to install them or 
where to put them on my system so I can use them.

What is the best procedure to do that? 

  1386 Jan  4 14:01 GRSC.PFM
 32768 Jan  4 14:03 GR.PFB
  1024 Jan  4 14:03 GR.PFM
 30955 Jan  4 14:03 GRB.PFB
  1017 Jan  4 14:04 GRM.PFM
 30871 Jan  4 14:04 GRBOS.PFB
  1023 Jan  4 14:04 GRBOS.PFM
 41598 Jan  4 14:04 GRI.PFB
  1039 Jan  4 14:04 GRI.PFM
 41653 Jan  4 14:04 GRIOS.PFB
  1045 Jan  4 14:04 GRIOS.PFM
 32215 Jan  4 14:05 GRSC.PFB