Hilversum: Hilversum Jong & Co, n.d (1960)
25 x 25cm, 24pp, original wrappers and printed paper outer wrapper/slipcase which explains the Kwadraat-Blad project . The twelth of the Kwadraat-Bladen books produced by Pieter Brattinga for Hilversum Jong & Co as a way to promote their high-end printing business. The book contains essays on electronic music by Ton de Leeuw which are illustrated with various diagrams The text is in Dutch, English and French. VG+ in slightly worn wrap-around.