Hi Laryn,
 
It was just over a year ago that there was a long thread about FM and
PM.  Someone posted a link to a short magazine article (Ham Radio, it
seems it was, but not sure) that shed light on the fact that PM was
the first popular method of modulation for land mobile use.  I've
searched the archives of this list, but could not find it back. 
 
In the June 1970 issue of Ham Radio, there was a very good article called "Modulation Standards for VHF FM". Maybe that's what you're thinking of, but I don't know where it's posted.
 
73,
Bob








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