Alaska Trees and Shrubs

Viereck, Leslie A. & Elbert L.Little, Jr.

Common Trees of Puerto Rico and the Virgin Islands

Little, Elbert L., Jr. and Frank H. Wadsworth

North American Wild Flowers

Walcott, Mary Vaux

Plant Lore of Shakespear

Towne, Rosa [Illustrator]

The Chocolate Tree: A Natural History of Cacao

Young, Allen M.

100 Butterflies and Moths: Portraits From the Tropical Forests of Costa Rica

Miller, Jeffery C.; Daniel H. Janzen; Winifred Hallwachs

Kakteen an ihren Standorten

Rauh, Werner

Free-Living Freshwater Protozoa- A Colour Guide

Patterson, D.J.; S. Hedley

Clivias

Koopowitz, Harold

An Encyclopedia of Cultivated Palms

Riffle, Robert Lee & Paul Craft

The Various Contrivances by Which Orchids Are Fertilized by Insects

Darwin, Charles

Photo Guide to Trees of Southern Africa

van Wyk, Braam