Firefly & Fern

Lewis, Rose (Writer of children's books)

Ages 5–9sciencerenewable energy

Christine Petersen

Ages 8–10renewable energyscience and nature

Tilly Spetgang

Ages 8–14renewable energyscience and discovery

Ages 14–18renewable energysustainability

Theresa Heine

Ages 5–10renewable energysister relationships

Diane Gibson

Ages 6–10renewable energyscience

Judy Katschke

Ages 7–11renewable energyenvironmental awareness

Gretchen Woelfle

Ages 8–12technologyhistory

Scott Nickel

Ages 7–12inventionrenewable energy

Margaret Haerens

Ages 10–16renewable energyenvironmental science

David M. Haugen, Susan Musser

Ages 10–16renewable energyenvironmental science

Bob Pflugfelder

Ages 8–12science and discoverysibling relationships