There are several resources available on the Internet which aid in research about Theodore Roosevelt and other historic figures. Many of these resources are used by Park staff to further their research on Theodore Roosevelt.
Primary Sources:
Brookyln Eagle:1841-1902
http://eagle.brooklynpubliclibrary.org
Making of America: Cornell University
http://cdl.library.cornell.edu/moa/
Making of America: University of Michigan
http://quod.lib.umich.edu/m/moagrp/
New York Times: 1851-1980
http://query.nytimes.com
London Times:1785-1985
http://archive.timesonline.co.uk/tol/archive/