2 links
Dio Cassius (c. A.D. 40 - 110) - Cassius Dio Cocceianus
brainfly.net
PDF and hypertext selections from the 1914 Cary/Loeb translation of the Roman History.
Lacus Curtius: Cassius Dio's Roman History
penelope.uchicago.edu
Full text by chapter of the 1914 English translation by Earnest Cary.