Opposing Viewpoints
Opposing Viewpoints are mostly used by senior high school and lower undergraduate students. Many titles are updated every few years.

They can be a useful resource when beginning your research to help identify arguments on a topic, but should be used in conjunction with a range of other books and articles as the format and sources are limited. Some pointers to other resources you can use to find alternative viewpoints are below.

Contents
Opposing Viewpoints consists of a book series, videos and a database. The University of Delaware provides more information about the Opposing Viewpoints Resource Centre database:

"Opposing Viewpoints Resource Center draws on the acclaimed social issues series published by Greenhaven Press, as well as core reference content from other Gale and Macmillan Reference USA sources to provide a complete one-stop source for information on social issues."

Title lists for OVRC:
Journals
Reference sources

The list of journals and newspapers is almost entirely US publications only (with some Canadian newspapers). For international perspectives, you will need to consult additional sources. The list does not include many alternative press publications.

The books do draw from a wider range of publishers, and some government publications, but most titles are US-published.

Criticisms and reviews
One criticism of the titles is that they are too black-or-white due to their pro-con nature, and sometimes too simplistic. A comment from Booklist:
September 2001 reviewing Immigration: "This Opposing Viewpoints selection uses essays that swing wildly toward extremes to cover the topic..."

More reviews of the books are available at the publisher Gale's site.

Sources of alternative viewpoints
Marquette University Library provides a great list of resources that cover controversial topics including books, resources with pro-con formats, databases to find articles from alternative viewpoints and websites.

University of Minnesota Library also provides a list of resources in this area.

If you are able to access it, the Alt-Press Watch database is an excellent resource to find articles from the independent and alternative press.

The Alternative Press Index is also a very good resource, and their website also provides links to hundreds of alternative press sources online.

Comments and suggestions from others welcome!