I found a document on the DCNR website which lists various sources for Dolomitic limestone and calcitic limestone.  The list does not appear to be exhaustive. However, it appears that all the sources for Dolomitic (Hi-Mag) limestone are located in the Adams/ York/ Lancaster area.   New Enterprise is listed as having Hi-Cal limestone.

That makes sense.  You would expect limestone to be geographically located.  While the content analysis will vary some from location to location, you would expect Hi-Mag limestone to kinda run in the same vein; and the same would be true of Hi-Cal limestone.