Check your library. Usually you can find some aquarium books their, and if your library sells donated books its a good place to look. I agree that the internet is really your best up to date source. I can find cheap and big aquarium books from my library, but they are old. I guess the most informative one was published in 1981. It has a lot of good species descriptions, but other than that its really out of date. All the tanks in the book are metal frame tanks. And the only possible filters it has are UGF, sponge filte, and some weird air driven HOB filter.
I need to get Diana Walsteds book though, I've been meaning to for a while. Her El Natural style isn't my preferred method. But I bet the book is still a really interesting read.