1. OPEN SOURCES Content: Open Access Repositories (OPENDOAR)
Directory of Open Access Journals (DOAJ)
OAISTER
WHOLIS
GOOGLE SCHOLAR
GOOGLE BOOKS
The National Academy Press

2. OPEN SOURCES =OPEN ACCESS
OPENDOAR= Directory of Worldwide Repositories= Master & PhD Theses
DOAJ= Directory of Journals
OAISTER= Worldwide National & University Libraries
WHOLIS= World Health Organization
GOOGLE SCHOLAR= Academic documents
GOOGLE BOOKS= e-books
For more information see Alma Swan

3. Directory of Open Access Repositories. http://www.opendoar.org/
Master and PhD Theses from worldwide
Universities

4. Directory of Open Access Journals (DOAJ) is also from http://www. doaj

5. Type your terms or words
OAISTER: Libraries Worldwide
Type your terms or words
Click here
Select your resources

6. WHOLIS = World Health Organization http://www. who
WHOLIS = World Health Organization Search for “Air Quality Standards” or any term regarding your health

7. Select the terms that the systems is suggesting to you
Click here

8. Google Scholar
Remember that Google Scholar covers Universities & institutions not only from America but from the whole world. Click where PDF is listed.

9. Google Books: The same with OAISTER—we can see originals from the best universities and national libraries from all over the world.

10. This book, published in 1854, was digitized for the Harvard collection
This book, published in 1854, was digitized for the Harvard collection. The whole world’s memory is at your fingertips; use it properly.

11. The National Academies Press

12. Remember
Your results will depend on terms or words used and how you search the open access directories and databases.