Subject

• Limnology 4
• Aquatic biology 2
• Freshwater ecology 2
• Water -- Pollution 2
• Acid mine drainage -- Purification 1
• Aquatic ecology -- Pennsylvania -- Kahle Lake 1
• Aquatic insects 1
• Freshwater biology 1
• Freshwater ecology -- French Creek (N.Y. and Pa.) 1
• Freshwater ecology -- Pennsylvania -- McKee Run 1
• Gas well drilling -- Environmental aspects -- Pennsylvania -- Allegheny National Forest 1
• Oil well drilling -- Environmental aspects -- Pennsylvania -- Allegheny National Forest 1
• Sedimentation and deposition -- Pennsylvania -- Grunder Run Watershed 1
• Sedimentation and deposition -- Pennsylvania -- Hedgehog Run Watershed 1
• Stream ecology 1
• Stream ecology -- Pennsylvania -- Mill Creek 1