Scribd is a huge user-generated database of eBooks and community of writers. Due to the huge volume of eBooks it contains and also being user-generated in nature, it is not so easy to find something valuable there. You can try to browse its groups. There are several really cool groups there found for search each containing really good books.
The pdfstack.com is a simple search engine that is employed as a special tool in the search of e-books. The pdf search engine with a massive database of over 70 million files is growing by the day as nearly one fourth of a million files being added on a daily basis. PDF search. The search is done continually without any interruptions for causes like copy right violations. The website also lists the last 100 search and their search results to give the readers an idea of what browsers are looking for and to appreciate the diverse subjects and languages the searches have been made in.
PDFdatabase claims to contain more than 7 million pdf and doc files. The search is quite fast and focused. The search results are pretty self-explanatory: you will see the document name, size, the full URL, the related search tags and the download link.
PDFgeni is a free ebook search tool that helps you find free ebooks, articles, reports, data sheets, pdf templates and all other information that is in pdf format. You can preview the file before downloading it. The best thing is that you do not need to signup or register to use this free search engine. If you are researching about something and do not want to download all information, you can view pdf file for reference in preview and do not need to download them.
