Open textbooks are textbooks that have been funded, published, and licensed to be freely used, adapted, and distributed. These books have been reviewed by faculty from a variety of colleges and universities to assess their quality.
A free resource for ebooks, providing thoundsands of academic and peer-reviewed ebooks. Easy for searching and downloading sources.
This is an index of over 2.4 million electronic theses and dissertations (ETDs). The full text of all papers lives on the original hosting site, usually the repository of the university that granted the degree.
Provided by the European Patent Office, Espacenet offers more than 90 million patent documents from the 19th century right up to today.
Provided by The National Office of Intellectual Property of Vietnam. In this web site you can search information on patent, industrial design, trade mark which is published un-examined or is granted.
Provided by The National Office of Intellectual Property of Vietnam, Digipat is a digital library for patents. The search engine belongs to a project that aims to provide the public with fulltexts of national patents.
Google Patents includes over 87 million patent publications from 17 patent offices around the world, as well as many more technical documents and books indexed in Google Scholar and Google Books