The excellent RPC Online site has just added RPC Vol III (Nerva to Hadrian, AD 96–138) to their searchable database. The database now contains 23,322 Roman provincial coin types, and in addition to Vol III, also houses RPC Volume IV (Antoninus Pius to Commodus, AD 138-192) and RPC Volume IX (Trajan Decius to Uranius Antoninus, AD 249–254). I believe the plan is to eventually put all the RPC volumes online. Brilliant! http://rpc.ashmus.ox.ac.uk/