Brown, Stone-flies. Digitally enhanced from our own original 1892 edition of Favorite Flies and Their Histories by Mary…
https://www.rawpixel.com/image/401781/free-illustration-image-pattern-old-sepia-vintage-antique-mary-orvis-marburyFree Image from public domain license
Researching aquatic insects in the alpine. Original public domain image from Flickr