Ecology

The Nakimu Caves, Glacier Dominion Park

The Land of Enchantment: From Pike's Peak to the Pacific

The Underworld of Oregon Caves National Monument

Island Trail at Walnut Canyon. Walnut Canyon National Monument

Shark Tagging Progress

Kind Ape Bonds

Island Expeditions

Fishes of Chautauqua, Cowley and Elk Counties, Kansas

Wilderness Babies

The Mountain that was 'God

Wake-Robin

A Synopsis of the British Mosses

Woodland Paths

Fish Populations, Following a Drought, in the Neosho and Marais des Cygnes Rivers of Kansas

Guide to Yosemite

How We Are Fed: A Geographical Reader

Checking the Waste: A Study in Conservation

Rambles of a Naturalist

Birds, Beasts and Flowers

Hamewith