Tree planting made easy by new, automatic hand seeder! - Perpetual Forests, Inc.,; Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Seattle, Washington, Perpetual Forests, Inc, [1952], 1952)
https://www.biodiversitylibrary.org/bibliography/195741
Keywords: Equipment and supplies|Nurseries (Horticulture)|Prices|Seattle|Tree planting|Washington (State)|