Pennsylvania Geological Survey, Harrisburg, 1969, Third Edition.  G 33.  Trade soft cover, 164 pages including Indices.  Very good; some edge and cover wear to wraps, a few small spots on rear wrap, binding sound with reading crease along front spine edge.  Interior clean and unmarked; illustrated throughout with black & white maps and drawings by Albert E. VanOlden.  ‘This third edition contains seven new collecting localities not previously described. … More than 40 minerals and many more accurate mineral descriptions from the previously described localities also have been added.  Several minerals new to Pennsylvania are included.’ (from Preface)