I know that Google Books isn't the most convenient way to view a book, nor are the books available in one area always available elsewhere (different countries' copyright rules, I assume), but in the U.S. at least, you can now read the 1906 Johannine Grammar by Edwin A. Abbott.
Since I'm fairly ignorant of NT/Koine studies, I asked around first before posting this. I gather Abbott is still a respected authority.

