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ebrary offers the most flexible options for acquiring eBooks and other authoritative content from the world's leading publishers. ebrary offers an increasing selection of more than 41,800 eBooks of 220 distinguished international publishers.

Only abstracts available. 

Search and preview millions of books on Computer science from libraries and publishers worldwide using Google Book Search.

 Intech is an open-access site offering free reading and downloading of hundreds of books and a handful of journals in Electrical and Electronic Engineering. Especially well represented are Nanotechnology and Nanomaterials,Control Engineering & Robotics.

 Library Genesis is a scientific community targeting collection of books on natural science disciplines and engineering.

 PDF Drive is your search engine for PDF files. As of today we have 75,108,817 eBooks for you to download for free. No annoying ads, no download limits, enjoy it and don't forget to bookmark and share the love!

Booboon is a free search engine that provides an option to search for and download various PDF&DOC documents, data sheets etc.