Here is my very rough guide about searching for newspapers at the Library of Congress. Everything used is either public domain (US) or for non-profit educational purposes. Rights may vary in other countries.
The Library of Congress
The American Library of Congress, online, is a wonderful place to be. The treasure contained within and freely shared are an example on how these things should be done, how they should be done right. Included in their treasures is a section called Chronicling America, which is a large collection of old scanned newspapers. From their own site:
Chronicling America is a Website providing access to information about historic newspapers and select digitized newspaper pages, and is produced by the National Digital Newspaper Program (NDNP). NDNP, a partnership between the National Endowment for the Humanities (NEH) and the Library of Congress (LC), is a long-term effort to develop an Internet-based, searchable database of U.S. newspapers with descriptive information and select digitization of historic pages. Supported by NEH, this rich digital resource will be developed and permanently maintained at the Library of Congress. An NEH award program will fund the contribution of content from, eventually, all U.S. states and territories.
This is akin to saying the Sistine Chapel is a bit of Dulux ™ slapped on the ceiling.
The long way there is to go here: http://www.loc.gov/library/libarch-digital.html

http://www.loc.gov/library/libarch-digital.html
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