Printing proof for illustration of spoonbills
Printing proof for illustration of sunset
Corrected proof for illustrations of sunset and spoonbills
Study of a sunset
Overlay cutout studies of foliage
Diagram demonstrating how vegetation conceals animals; corrected proof for Concealing Coloration in the Animal Kingdom
Diagram demonstrating how vegetation conceals animals; original illustration for Concealing Coloration in the Animal Kingdom
Corrected proof for illustrations of caterpillars and vegetation
Corrected proof for illustrations of caterpillars and vegetation
Watercolor collage and illustration plates of male wood ducks, for Concealing Coloration in the Animal Kingdom
Diagram demonstrating camouflage principles of bird plumage; original illustration for Concealing Coloration in the Animal Kingdom
Diagram demonstrating camouflage principles of silhouettes; original illustration for Concealing Coloration in the Animal Kingdom