The Four Powers

From Author Wars - https://authorwars.com/publications/the-four-powers-518609.html

Overview:

Title: The Four Powers
Author: Hannes Bok
Year: 1969
Publisher: The Bokanalia Memorial Foundation
Pages: [4]
Binding: other
Type: Non-fiction
Title Reference: The Black Powers
Notes: Offset printed reprint of original lithographs, sold only as a set.
B&W, image area 10" x 14".
Each print has "© 1969 Bokanalia" at the center bottom and show the title of the artwork on the left side and Hannes Bok 1944 or 1945 at the right side of the bottom.