Pitzonka's high quality pansies - Pitzonka's Pansy Farm.; Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Bristol, Penna, Pitzonka's Pansy Farm, [1949?], 1949)
https://www.biodiversitylibrary.org/bibliography/189128
Keywords: Bristol|Catalogs|Nursery stock|Pansies|Pennsylvania|Plants; Ornamental|Varieties|