Olavi K. Fält, Maailmanhistorian periodisointi
(Faravid /1978)

Faravid_02_002 Faravid_02_003 Faravid_02_004 Faravid_02_005 Faravid_02_006 Faravid_02_007 Faravid_02_008
Faravid_02_009 Faravid_02_010