Lee Toone reports that the 1958-2003 volumes of Revue Numismatique are online at http://www.persee.fr/.
The site is searchable by article title, and Moneta has direct links to all of the volumes. Individual articles can be read online or downloaded.
There seems to be some problem with the plates. The titles of the plates are available, but where the coins should be is a tiny picture of a lock. The PDF downloads for the plates claim to be large (40+ MB) but upon downloading are small (3 MB) and contain the same glyph of a lock where the coins should be.
Bulletin de correspondance hellénique is also available from Persee.
For older volumes, Google Books has three 19th century volumes.
I don't know much about Persee. It claims to be in beta. It has an icon for English-language access. It seems to be from the Ministry of State for Higher Education and Research.
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