There is a growing list of great mineral PDF files on the web.
Here is the latest I found:  From PA Dept of Natural Resources.

Please see Pennsylvania Geology for information on how to subscribe to the magazine. There are a limited number of copies available for some of the back issues. To obtain copies of selected back issues or for information on where the magazine may be viewed in public libraries, contact Jody Zipperer.

Please note that, in rare instances, the online version of the magazine has been changed from the printed version to correct errors. These changes are noted in the “Contents” links below.
NOTE ON OPENING PDF* FILES: If you cannot open a PDF file through your browser, right-click on the file, save it to your hard drive, and then open it in Acrobat Reader.

Year 2009 (Volume 39)

Fall
v. 39, no. 3
      
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Summer
v. 39, no. 2
      
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Spring
v. 39, no. 1
      
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Year 2008 (Volume 38)

Summer/Fall
v. 38, no. 2/3
      
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Spring
v. 38, no. 1
      
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Year 2007 (Volume 37)

Fall/Winter
v. 37, no. 3/4
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Summer
v. 37, no. 2
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Spring
v. 37, no. 1
      
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Year 2006 (Volume 36)

Winter
v. 36, no. 4
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Summer/Fall
v. 36, no. 2/3
      
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Spring
v. 36, no. 1
      
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Year 2005 (Volume 35)

Fall/Winter
v. 35, no. 3/4
      
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Summer
v. 35, no. 2
      
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Spring
v. 35, no. 1
      
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Year 2004 (Volume 34)

Winter
v. 34, no. 4
      
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Fall
v. 34, no. 3
      
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Summer
v. 34, no. 2
      
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Spring
v. 34, no. 1
      
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Year 2003 (Volume 33)

Winter
v. 33, no. 4
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Fall
v. 33, no. 3
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Summer
v. 33, no. 2
     
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Spring
v. 33, no. 1
     
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Year 2002 (Volume 32)
(Three issues were printed in 2002.)

Fall/Winter
v. 32, no. 3/4
 
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Summer
v. 32, no. 2
    
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Spring
v. 32, no. 1
   
 Contents
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Year 2001
(No issues were printed in 2001.)

Year 2000 (Volume 31)
(One issue was printed in 2000.)

Spring
v. 31, no. 1
      
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Year 1999 (Volume 30)
(Two issues were printed in 1999.)

Fall/Winter
v. 30, no. 3/4
  
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Spring/Summer
v. 30, no. 1/2
   
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Year 1998 (Volume 29)
(Three issues were printed in 1998.)

Winter
v. 29, no. 4
     
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Summer/Fall
v. 29, no. 2/3
    
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Spring
v. 29, no. 1
     
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Year 1997 (Volume 28)
(Two issues were printed in 1997.)

Fall/Winter
v. 28, no. 3/4
   
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Spring/Summer
v. 28, no. 1/2
   
VIEW