Lydian in Bold and Bold Condensed styles for the cover of The Eleventh Commandment, a 1962 science fiction novel by Lester del Rey (1915–1993). Cover design by Leo and Diane Dillon.
From Joachim Boaz’s 2012 review for Science Fiction and Other Suspect Ruminations:
The Eleventh Commandment is a thought-provoking piece of 60s social science fiction — the themes of religion, bioengineering, overpopulation, pollution, are all discussed in depth. Although in no where as poignant, experimental, and brilliant as John Brunner’s Stand on Zanzibar (1968) which discusses similar themes, del Rey’s contribution to the overpopulation subgenre is worth reading.