Peterson First Guides (1998–1999)
- Butterflies and Moths (1998)
- Peterson First Guide to Birds of North America (1998)
- Peterson First Guide to Caterpillars of North America (1998)
- Peterson First Guide to Clouds and Weather (1998)
- Peterson First Guide to Insects of North America (1998)
- Peterson First Guide to Rocks and Minerals (1998)
- Peterson First Guide to Trees (1998)
- Peterson First Guide to Reptiles and Amphibians (1999)