Willem de Ridder, Paper Flux Work, late 1960s, Offset printed cards in envelope, Harvard Art Museums, Cambridge. https://dartabase.art/cite/harvard/4676

Edward Ruscha, Study for "Box Smashed Flat (Vicksburg)", 1960, Graphite on cream tracing paper, Harvard Art Museums, Cambridge. https://dartabase.art/cite/harvard/4869

Ida Griffin, Fluxfest, 1967, Harvard Art Museums, Cambridge. https://dartabase.art/cite/harvard/5853