Heinle, Erwin. Towers : a historical survey / Erwin Heinle, Fritz Leonhardt. - London ; Boston : Butterworth Architecture, 1989. - 343 p. : chiefly ill. (some col.) ; ISBN: 0408043067 Subjects--Topical Terms: Towers.Tall buildings. LC Class. No.: NA2930 / .H4513 1989b