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On this page readers can obtain a listing of documents under the subject headings. Click on the bookshelf icon of a subject heading to display the sub-headings, or to return to the main subjects. Click on the icon of a sub-heading to obtain the concerned documents.
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close this section of the libraryScience, Research, Appropriate Technology
open this section of the library and view contentsAppropriate Technology
open this section of the library and view contentsScience and Technology, Research

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