v. 1. Conifers and important hardwoods, by E.L. Little, Jr.--v. 2. Alaska trees and common shrubs, by L.A. Viereck and E.L. Little, Jr.--v. 3. Minor western hardwoods, by E.L. Little, Jr.--v. 4. Minor eastern hardwoods, by E.L. Little, Jr.--v. 5. Florida, by E.L. Little, Jr.--v. 6. Supplement, by E.L. Little, Jr