1. ANIMALS
   1. Amphibians
      1. frogs
   2. Arthropods
      1. insects
         1. behavior
         2. butterflies
         3. caterpillars
         4. moths
      2. centipedes & millipides
      3. spiders
   3. Birds
      1. birding in general
      2. biding field guides
   4. Mammals
      1. bats
      2. raccoons
      3. rats
      4. squirrels
      5. tracks & tracking
   5. Mollusks
      1. snails & slugs
   6. Reptiles
      1. lizards
      2. snakes
      3. turtles
   7. Segmented Worms
      1. earthworms

2. PLANTS
   1. Edible Wild Plants
   2. Flowering Plants
      1. tree identification
      2. trees in general
      3. weeds
      4. wildflowers
   3. Gardening
      1. herbs
      2. perennials
   4. Spore Producers
      1. ferns
      2. lichens
      3. liverworts
      4. mosses

3. FUNGI
   1. Mushroom basics
   2. Mushroom field guides
   3. Eating mushrooms

4. ECOLOGY
   1. Composting
   2. General Environment
   3. For Environmental Activists

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5. GEOLOGY
   1. Fossils
   2. Rocks & Minerals

6. AT THE BEACH
   1. Field Guides
   2. Communities & Ecology

7. NATURALIST "TOOLS"
   1. Books with Good Nature Writing
   2. Fieldguides for Identification
      1. Audubon Guides
         1. "Field Guide Series"
         2. "First Field Guides"
         3. "Pocket Guides"
         4. "Regional Guides"
      2. Golden Series
      3. Peterson Series
   3. Identification Keys
   4. Magazines about Nature
   5. Regional US Nature Guides
      1. California
      2. Midwest
      3. Northeast
      4. Northwest
      5. Rocky Mountains
      6. Southeast
      7. Southwest
      8. Texas

8. NAMES & CLASSIFICATION
   1. Evolution

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