Structure and evolution of galaxies lectures presented at the NATO Advanced Study Institute held at the International School of Astrophysics at the "Ettore Majorana" Centre for Scientific Culture in Erice (Sicily) Italy, June 22-July 9, 1974 - Setti, Giancarlo, 1935-; Setti, Giancarlo (NATO advanced science institutes (NATO ASI series). Series C, Mathematical and physical sciences ;, 1975)