They are a collection of practical manuals to help improve local standards of living all over the world. Wycliffe Associates have a web site that contains over 500 titles, all freely available for you to download. The base language is English but many of the books have been translated into French, Portuguese and Spanish. Go to

http://www.shellbooks.org

to see the wide range of titles. Download whatever you want or ask for a free CD with all the books.