Pitzonka's giant-flowering mixture of pansy plants : fall 1938 - Pitzonka's Pansy Farm.; Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Bristol, Penna, Pitzonka's Pansy Farm, [1938], 1938)
https://www.biodiversitylibrary.org/bibliography/170628
Keywords: Bristol|Catalogs|Nursery stock|Pansies|Pennsylvania|Perennials|