The "Do It!" image came via Meade who saw it at
Magnificent Ruin and IM'd it to me, where it appeared in my iChat window right under the
Saul Steinberg "Don't," which I'd IM'd to him after he IM'd me
this Saul Steinberg "No!," which he'd IM'd to me because of
my first post of the day, quoting Bob Dylan, asking about that carried-in-arms daughter who always told her father "no," which I blogged about because Meade had started singing "Tears of Rage," a song that mentions Independence Day, which it is, and which — fittingly — embodies the spirit embodied in "Do It!"
"DO IT!: Scenarios of the Revolution," is a book by Jerry Rubin — Introduction by Eldridge Cleaver — which you can buy at that Amazon link. That's the Simon & Schuster publication, but in the poster image above, we see the tiny logo — in the lower right-hand corner — for a different publisher:
Erectile Press. Erectile Press?! Maybe that was the hard-cover edition.
UPDATE, 11/16/17: I'm adding a tag and seeing the "Do It!" image is gone. I tried to use the "Wayback Machine" to recover it, but could not. Sorry! Sad to see this post go to ruin. They did call that place Magnificent Ruin. I could have preserved the image if I'd handled it differently. Ah, well...