[Violets] - Krogman'S Violetry,; Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Milwaukee, Wisconsin, Krogman's Violetry, [1956], 1957)
https://www.biodiversitylibrary.org/bibliography/205887
Keywords: Commercial catalogs|Milwaukee|Nursery stock|Prices|Varieties|Violets|Wisconsin|