La escritura en libertad. Antología de poesía experimental edited by Fernando Millán and Jesús García Sánchez, 2005. Includes (old) works by Chopin, Jandl, Gappmayr, Garnier, Cobbing, Pazarkaya and Riddell.
By Bob Cobbing, 1960s. More of his work here.
Art Typing by Nathan Krevolin. Published by Pitman in 1967, 8th printing 1974. Thanks to Andrew Belsey for sharing this.
Update: the book is now available on archive.org thanks to Marcin Wichary.