Set of 2 vintage framed bird prints

These have been in the family for at least 45 years. I found a bit about them in A History of the Birds of Europe, Including All the Species Inhabiting the Western Palearctic Region, Henry Dresser, by Fines Mundi, 2015. I don’t have access to the full volumes to find out more about them. They are obviously old, but still look nice. The frames are about 17 x 19 x 1.5 inches and are very sturdy. Each item weighs approximately 3.5 pounds.