Find Professional Literature: Archives-Databases-Keywords

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19.PdfMeta
A easy way to find PDF files.

http://www.pdfmeta.com/

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20.Avian Review

This website is for birders and for those who have an interest in finding, reading, or collecting bird books. This website serves two key purposes, which are to...

One: Arrange and show the wide variety of bird books that exist in the different categories of countries, regions, family groups, or species.
Two: Describe or show what's in these books to help your decision making process on whether or not to find and buy the book.

http://sites.google.com/site/avianreview/

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21.iSpot - A site to help you identify anything in nature

iSpot is a website aimed at helping anyone identify anything in nature.
Once you've registered, you can add an observation to the website and suggest an identification yourself or see if anyone else can identify it for you.

http://ispot.org.uk/

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22.BookFinder

BookFinder.com is a one-stop ecommerce search engine that searches over 150 million books for sale—new, used, rare, out-of-print, and textbooks. We save you time and money by searching every major catalog online, and letting you know which booksellers are offering the best prices and selection. When you find a book you like, you can buy it directly from the original seller; we never charge a markup.

(Books written in English, French, German, Italian, and Dutch)

http://www.bookfinder.com/about/