Sun Earth. How to Apply Free Energy Sources to Our Homes and Buildings by Solar Group Architects was published by A.B.Hirschfeld Press in Denver, Colorado in 1976. There’s a related volume titled Sun Earth. How To Use Solar and Climatic Energies Today, with a similar design. It’s credited to Richard L. Crowther (concepts, text), Paul Karius (graphics, text) Lawrence Atkinson (text, cover design), and Donald J. Frey (text, editing).
[Richard L. Crowther’s] pioneering work in residential solar technology led to lectures at the Smithsonian Institution, solar conferences and universities across the U.S. Crowther’s architecture publications are still used to teach students. His “Sun-Earth” text has a reputation for setting a benchmark in holistic architecture design, with arguments outlining economic and environmental benefits. —Wikipedia
The title on the silver book cover is rendered in outlined caps from Helvetica Bold, set on an angle, with overlapping letters.