Or:
Aviation Handbooks & Manuals

(Most notably:
http://www.faa.gov/library/manuals/a...h-8083-27a.pdf

Airplane Flying Handbook
Pilot's Handbook of Aeronautical Knowledge
http://www.faa.gov/library/manuals/a...h-8083-19A.pdf
http://rgl.faa.gov/Regulatory_and_Gu...llDocument.pdf

There's enough information there to build a pretty solid foundation well in advance of any learning; with online resources to ask questions of, you have most of what you need to learn enough to pass your written test.

Most FAA publications are available online as PDFs, and most of those who print and sell aviation books copy a large majority of the information, figures, structure, and sometimes verbatim paragraphs straight out of the FAA pubs.

If you have any other questions in that vein, I'd be happy to try and point you in the right direction.

~Fox