• berks mineralogical society's display at birdsboro quarry open house, 10-14-06-1
  • berks mineralogical society's display at birdsboro quarry open house, 10-14-06-2
  • map of birdsboro quarry at open house, 10-14-06-1
  • engines preparing to take a load of material at birdsboro quarry open house, 10-14-06-1
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