File:The adventures of sherlock holmes.jpg

Summary
This book cover is in the public domain. Per the creator, Standard Ebooks

From their website:

"And while all of the ebooks we feature and the cover art we draw from are already believed to be in the public domain in the US, Standard Ebooks releases all of the work we put in to each ebook into the public domain too. That makes each and every one of our ebook files not just free, but libre too—because the world deserves more unrestricted culture."