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Custom Search on the databases below:
The open research platform of educational resources of the Center for Innovation in Technology and Education (Innov@TE) from the Virtual University of Technology of Monterrey, Mexico
Research platform of Social Sciences
TEMOA: Open Educational Resource
Research platform of open educational resources from the Virtual University of Technology of Monterrey, Mexico

African Journals Online
African Open Access Journals
Articles in the fields of physics, mathematics, non-linear Sciences and Computer Science
  World Digital Library
Project driven by UNESCO that brings together maps, texts, photos, recordings and films.
Databases Embrapa
The Database of Agricultural Research - EMBRAPA 
Database for the teaching of biology, Human Biology and Histology
A to Z open access journals of Medicine and its specialties
e-books on open access

  CECS - eBooks
It offers some e-books of the Center for the Study of Communication and Society, University of Minho 
It offers millions of chemical structures
CiteSeer - Scientific Literature Digital Library
Articles in the area of Computer Science and Digital Libraries
  CLACSO - Network of Virtual Libraries of Social Sciences in Latin America the Caribbean
Contains magazines, articles, books, working papers, theses, multimedia, etc. 
  Dart-Europe E-Theses Portal
European portal with theses since 1597 
DBLP Computer Science Bibliography
Bibliographic database in computer
  DOAB - Directory of Open Access Books
Directory of Open Access to Electronic Books
  DOAJ - Directory of Open Access Journals
Directory with open access journals in the various fields of knowledge
Eldis Gateway to Development Information
Documents areas: Population, Agriculture, Biodiversity, Education, Health, Tourism, Trade
  E-journal - Universidad Nacional Autonoma de Mexico
Online journals and full-texts of: Exact Sciences, Life Sciences, Earth Sciences, Social Sciences, Veterinary Medicine
  E-Print Network
A gateway to over 5.5 million e-prints in basic and applied sciences: physics, chemistry, biology and life sciences, science material, nuclear sciences and engineering, energy, computers and information technology. 
Medical journal, Biology, Microbiology, Animal Science, Veterinary Medicine and full-text online
  Front for the Mathematics ArXiv
Full-text articles of Mathematics
  HighWire Press
Full-text journals in the fields of Medicine and Earth Sciences 
Hindawi Publishing Corporation
Hindawi publishes over 300 journals on Open Access, covering a wide range of academic disciplines
  IDEAS and Research Papers in Economics
Base Economy
  INTECH - Ebooks e periódicos
It offers more than 2201 E-Books and even 7 publications in open access journals
Directory of open access journals. It has more than 8000 journals
Theses in full-text
  Networked Digital Library of Theses and Dissertations
Digital Library of Theses and Dissertations worldwide (NDLTD) 
OAPEN Library
Contains e-books in all fields of knowledge
  OICRF - International Office of Register and Land Records
Existing records and land registration, comparative studies of this material and the publication of results systems
  Open Access Theses and Dissertations
Offers over 1.5 million dissertations and theses
Optimization Online
Online Optimization of Mathematical Optimization Society
  Organic Eprints Archive
Organic E-prints Archive developed by the International Centre for Research in Organic Food Systems
  PLoS - Public Library of Science
Online journals and full-text: PLoS Biology, PLoS Medicine, PLoS Computational
PubMed Central - Digital Library of Medicine 
A to Z journals in open access of Life Sciences
  Public Knowledge Project
Magazines for free access to all areas of knowledge
  Redalyc - Red de Revistas Científicas de América Latina y el Caribe, España y Portugal
SciELO Livros
SciELO Books offers books on open access
  Scielo Portugal
Portuguese contains a selected collection of scientific journals
  Scielo - Scientific Electronic Library Online
Contains a selected collection of Brazilian scientific journals
Web site directed to the Forestry and Remote Sensing
Portal Journals in Communication Sciences
Allows you to search over 410 million scientific items indexed.
TEL (thèses-en-ligne)
Theses in open access
  VideoLectures. NET
VideoLectures.NET is a repository of videos on open access. These videos are recordings of lectures, workshops, conferences, etc.


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