A compendium like this hasn't been seen since Storyteller Without Words (Abrams, 1974).
God's Man (Jonathan Cape and Harrison Smith, 1930), reprinted (Dover, 2004)
Madman's Drum (Jonathan Cape and Harrison Smith, 1930), reprinted (Dover, 2005)
Wild Pilgrimage (Harrison Smith and Robert Haas, 1932), reprinted (Dover, 2008)
Prelude to a Million Years (Equinox, 1933), reprinted (Dover, 2010)
Song Without Words (Random House, 1936), reprinted (Dover, 2010)
Vertigo (Random House, 1937), reprinted (Dover, 2009)
Unfortunately, Ward's incomplete novel, printed in a limited edition as Lynd Ward's Last Unfinished Wordless Novel (Harsimus Press, 2001) is not readily available.
Not many monographs on Masereel in English. Roger Avermaete's Frans Masereel (Rizzoli, 1977) is a nice American edition. Stefan Zweig's Der Zwang (Enforcement) was illustrated by Masereel, and the writer also contributed to a monograph on the artist.
A pretty good introductory book on the subject.
Also, while we're on the subject of relief printmaking, people should be more familiar with a contemporary master, Artemio Rodriguez. He used to live in Los Angeles, had a print studio La Mano Press, recently relocated to Mexico to dedicate himself to El Huerto, Centro de Ecologia y Artes (The Orchard, Center for Ecology and Arts). Many years ago, I met him when he was just starting out in the U.S. at La Luz de Jesus Gallery, and he's a nice guy ).
You're no good anymore, 2002. Linocut.
La Loteria IV, 1996. Linocut.