Here’s a list of filmmakers that author Sheldon Renan wrote bios for in his seminal ’67 book An Introduction to the American Underground Film.

Here are some fantastic underground film posters made in England in the ’70s, with posters promoting the work of Andy Warhol, Kurt Kren, Stan Brakhage and more.

Kill Your Timid Notion is a festival of underground film and performances, including work by Ken Jacobs, Kurt Kren, Andrew Lampert, Hollis Frampton and more.