Vegetation of the Rocky Mountain Region, and a Comparison with That of Other Parts of the World

Manual of the botany of the northern United States

Scientific Papers of Asa Gray

Botany for Young People

Gray's new Manual of Botany, a Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and Adjacent Canada

Genera Florae Americae Boreali-Orientalis Illustrata

Introduction to Structural and Systematic Botany, and Vegetable Physiology,

Gray's New Manual of Botany

How Plants Grow...

Botany for Young People and Common Schools

Botany for Young People