For BEST value choose the ONLINE VERSION Resource Guide
Because the Web changes instantly many useful reports, links, booklets, images disappear, sites go away, links change, so over the last 15 years I have saved and sorted the best information for these Resource Guides. For $10 average cost, each ONLINE FOLDER is filled with 3,000+ pages, including many, many resources, all by topic of interest! And there are now many new educational sites which offer complete books for you to read. Plus articles, color images, websites, links, and hard to find files and data. You get an extensive Building Library in an easy access online site at DROPBOX.! (a program that lets you open and read all the files.)