One of the thing that can slow down Peanuts research is the ability of Google to find Snoopy everywhere… even if it’s an illusion. For example, when searching for uses of the word “Snoopy” in books from the 19th century, Google served me up the following examples.
Two guys named Snoddy who were awarded a patent:
And this one, which is utterly Greek to me:
But then I find wins like this: