Natural science and religion

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