The Random House book of shrubs

Trees and shrubs for Pacific Northwest gardens

Grant, John A.

Trade list to nurserymen only

Tennessee Valley Nursery

Ornamental shrubs for temperate zone gardens

Hyams, Edward

The Hillier Colour dictionary of trees and shrubs

Harold G. Hillier

Flowering Shrubs (Time-Life Encyclopedia of Gardening)

James Underwood Crockett

Wholesale trade-list

Biltmore Nursery (Biltmore, N.C.)

Manual of trees & shrubs

Harold G. Hillier

Trees for Long Island

Hicks Nurseries (Westbury, Nassau County, N.Y.)

Best in the world

J. Wilkinson Elliott (Firm)