Finding curated public domain images

Xavier de Maistre in an armchair, displaying his “book of discoveries” (Veyssier, 1860 ) Every so often I like to include a public domain image in a blog post. I’m fond of the woodblock and lithographic illustrations of the late 1800s. I try to avoid indiscriminately (un-)splashing every post but the real reason for the infrequency isn’t radical self-control, it’s because dumpster diving for…