All in one, 2020 Scott United States Commemorative, Regular and Air Post Plate Block Supplement #4 (11 pages).
 
This supplement is complete with all United States plate blocks issued through 2021, as listed in the Scott Standard Postage Stamp Catalogue, unless otherwise noted. Items not listed as having plate numbers are not included. 
 
Size: 10 x 11.5
Hole Punch: 3-Ring & 2 Square Post
Series: National