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.
As an interesting side note…If thre are any of you really interested in Biblical authors and their Grammar, I would suggest you pick up Nigel Turner’s “Style” installment of the Moulton Greek Grammar set here.
He talks about every author of the New Testament, their style, Semitic and Aramaic influence, and all of that authors particular grammatical/syntactical peculiaraties. It is a fascinating, enjoyable read, and to date is the only Grammar I have read cover to cover.