Nature

Ireland: A Smithsonian Natural History

Primates in Question: The Smithsonian Answer Book

Fossil Plants:

Cats in Question: The Smithsonian Answer Book

Snakes in Question, Second Edition: The Smithsonian Answer Book

North American Tree Squirrels:

Dragonflies:

Whales and Dolphins in Question: The Smithsonian Answer Book

Common Fossil Plants of Western North America, Second Edition:

Bats in Question: The Smithsonian Answer Book

Agnes Chase's First Book of Grasses: The Structure of Grasses Explained for Beginners, Fourth Edition

Red Fox: The Catlike Canine