Re3data.org – Registry of Research Data Repositories. Dataset Search. The Catalog of Copyright Entries: Registrations, 1924-1949. Registrations from 1925 to 1949 This page contains links to copyright registration records in the Catalog of Copyright Entries and other sources, from 1925 to 1949.
Original copyrights from these years may still be in force if they were renewed, or if they were exempt from renewal requirements. Copyrights from earlier years that were renewed during this time period have expired in the US. See this page for more details. More recent copyright registrations (from 1950 and later) are also available via this site, as are historic registrations from 1924 and earlier (all of which have by now expired). Below we link to scans of the volumes, provided by Google and the Internet Archive. Credits If you'd like to suggest better copies of these volumes, or provide more convenient forms and interfaces for the records linked from here, write onlinebooks@pobox.upenn.edu to find out more how you can get involved with this project. Home -- About Us -- Get Involved! Publications, data, projects, ... BASE – Bielefeld Academic Search Engine. BASE is one of the world's most voluminous search engines especially for academic web resources.
BASE provides more than 200 million documents from more than 8,000 content providers. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library. We are indexing the metadata of all kinds of academically relevant resources – journals, institutional repositories, digital collections etc. – which provide an OAI interface and use OAI-PMH for providing their contents (see our Golden Rules for Repository Managers).
The index is continuously enhanced by integrating further sources / content provider (you can suggest to add a content provider which is not indexed yet). BASE is a registered OAI service provider. In comparison to commercial search engines, BASE is charcterised by the following features: Start searching BASE. Open Science Directory. Science, health and medical journals, full text articles and books.
Paperity - Multidisciplinary aggregator of Open Access journals & papers. Welcome to the Registry of Open Access Repositories - Registry of Open Access Repositories. An Experimental Classification Service. Enter an ISBN, OCLC#, UPC, or ISSN Standard Number: An ISBN is a unique number assigned to an item by its publisher.
Each ISBN is a 10 or 13 digit number. Thirteen-digit ISBNs must begin with either 978 or 979. Enter ISBNs with our without hyphens. For example; OCLC assigns a unique number to each bibliographic record input into WorldCat. The Universal Product Code (UPC) is a barcode symbol that is used to track trade items in stores (e.g., audio and video products). The first digit is the Number System Character (NSC) which appears on the left side of the symbol outside of the bars. Enter all digits found on the item (e.g., 008817006925). An ISSN is a standardized international code which allows the identification of a serial publication. Data repositories - Open Access Directory.
From Open Access Directory This list is part of the Open Access Directory.
This is a list of repositories and databases for open data. Please annotate the entries to indicate the hosting organization, scope, licensing, and usage restrictions (if any). If a repository is open in some respects but not others, please include it with an annotation rather than exclude it. If you're not sure whether a given dataset or data collection is open, post your query to Is It Open Data?
Archaeology Also see Social sciences. Astronomy Also see Physics. Home Page - Directory of Open Access Repositories. OpenEdition. DOAB – Directory of Open Access Books. Directory of Open Access Journals. CORE - Open Access Articles.
Free full-text scholarly articles. RefSeek - Academic Search Engine. Databases and Useful free resources - in English. Sources of Data.