I didn't see an AC/DC thread so here goes.
Official Website
February 17, 1975 High Voltage (Australia only)
December, 1975 T.N.T. (Australia only)
May 15, 1976 High Voltage (International)
December 17, 1976 Dirty Deeds Done Dirt Cheap
June 23, 1977 Let There Be Rock
May 25, 1978 Powerage...