To give the full meaning of an acronym

 AUTHORITY:

     Published by GALE

 ARRANGED:

     Volume I: 520,000 entries, alphabetically, focusing mainly on the U. S.
       but acronyms from Western Europe are included
     Volume II: provides 15,000 new acronyms - not in JWL
     Volume III: is the reverse companion

 REFERENCE QUESTIONS:

     What are the initials for a clergy?
       [ use the reverse for this = CL vol.III, pt.1, p.672 ]
     Yes, there is this abbreviation "TouchST." What does it stand for?
       [ TouchStone Software Corp. = vol.I, pt.1, p.4271 ]
     What do the initials FLDTNS stand for ?
       [ Field Trains = vol.I, pt.2, p. 1652 ]