bibliography

http://kclibrary.lonestar.edu/decade00.html

http://kclibrary.lonestar.edu/decade10.html

http://kclibrary.lonestar.edu/decade20.html

http://kclibrary.lonestar.edu/decade30.html

http://kclibrary.lonestar.edu/decade40.html

http://kclibrary.lonestar.edu/decade50.html

http://kclibrary.lonestar.edu/decade60.html

http://kclibrary.lonestar.edu/decade70.html

http://kclibrary.lonestar.edu/decade80.html

http://kclibrary.lonestar.edu/decade90.html