1975 - 1982 20c State Birds and Flowers: Minnesota - Mystic Stamp Company
USPS STATE BIRDS & FLOWERS (50) 20 cent stamp sheet 1981-1982 MNH OG-FRAMED
Stamps for Sale - The Portland Stamp Company
1964 - 1982 20c State Birds and Flowers: Idaho - Mystic Stamp Company
20 Cent Birds US Stamp Sheets for sale
The Fifty State Birds and Flowers Mint SET - U.S. Stamps & Folder
State Bird Stamps — Little Postage House
1969 - 1982 20c State Birds and Flowers: Kentucky - Mystic Stamp Company
The Fifty State Birds and Flowers Mint SET - U.S. Stamps & Folder