Environmental Protection

Drop by Drop

EcoPlate

Eco Loops

Efficient Energizer

Eternal Wear

Where Men No More May Reap or Sow

Earth Science and Earth Structure

Nature's Teachings: Human Invention Anticipated by Nature

Tree Magic

Gifts of an Eagle

Our Wild World

Wild and Wonderful

Mammals of the San Gabriel Mountains of California

The Whelps of the Wolf

A Bird-Lover in the West

Watched by Wild Animals

Bears I Have Met—and Others

The Silent Places

Roof and Meadow

The New 50 Simple Things Kids Can Do to Save the Earth