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The Natural World

  • Birds of America (Audubon). , Z-3132 - Z-3181
  • Buffalos, Eagles & Elephants. , ZZ-7156 - ZZ-7221
  • Dahlias. , X-2898 - X-2951
  • Digging up Dinosaurs. , X-0031 - X-0060
  • Eruption of Mount St. Helens. , ZZ-6551 - ZZ-6590
  • Evolution of the Horse. , X-0061 - X-0085
  • Hunting & Collecting Fossils. , ZZ-5636 - ZZ-5666
  • Man-Prehistoric. , X-0086 - X-0118
  • Pandas. , ZZ-6883 - ZZ-6948
  • Snow Crystals. , X-0143 - X-0154
  • Some Common Rocks & Minerals. , X-2863 - X-2897
  • Some Western Pennsylvania Wildflowers. , Z-9671 - Z-9757
  • Volcano Is Born. , X-000l - X-0030
  • Wildlife. , Z-6764 - Z-6799