A good place to start to gather information on the History of East Asia
Brill's Encyclopedia of China REF DS 755.B86 2009
Berkshire Encyclopedia of China (5 vol.) REF DS 735.A2 B47 2009
China Today, An Encyclopedia of Life in the People's Republic (2 vol.) REF DS 777.6.C458 2005
Chinese History, A Manual REF DS 735.W695 2000
National Geographic Atlas of China REF G 2305.N38 2008
Encyclopedia of Modern China (4 vol.) REF DS 755.E53 2009
The Kodansha Bilingual Encyclopedia of Japan REF DS 805.K6323 1998
Japan Encyclopedia REF DS 821.F73 2002
Encyclopedia of Contemporary Japanese Culture REF DS 822.5.E516 2002
Korea, A Historical & Cultural Dictionary REF DS 902.P737 1999
A Handbook of Korea REF DS 902.H2864 1998
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British Museum's Ancient China Resources http://www.ancientchina.co.uk/menu.html
Stanford Guides to Japan Resources (SPICE) https://spice.fsi.stanford.edu/docs/internet_guides
Internet East Asian History Sourcebook http://www.fordham.edu/halsall/eastasia/eastasiasbook.html
Korea's History Links http://www.asianinfo.org/asianinfo/korea/history.htm
History of China (Survey and Overview) http://www-chaos.umd.edu/history/toc.html
Tibet and Himalayan Library http://www.thlib.org