I’ve noticed this too

Perhaps you haven’t read Mrs. Molesworth’s “Uncanny Tales” or C. Schweigger’s “Schweigger on Squint.” Perhaps you missed “How to Be Happy Though Married” or the Farmers’ Bulletin devoted to “House Rats and Mice.” No worries. They are available in 24 digital formats, including versions to suit just about any e-book reader you own. These titles, and millions more, are all out of copyright and part of the accelerating effort to digitize the public domain contents of the world’s libraries.

Every e-book reader seems to come preloaded with a few canonical titles — “Pride and Prejudice” or “Alice in Wonderland,” for instance. But there has never been a better time to be a slightly faded writer just beyond the cusp of copyright, like Edgar Wallace or Hilaire Belloc. Their voluminous works — not easily found in your local library — are now copiously available to the digitally curious.

…How “My Unknown Chum” by Charles Bullard Fairbanks was selected for digitizing is unclear.

Here is a bit more.