Merrill, Richard Energy primer, solar, water, wind, and biofuels / Richard Merrill and Thomas Gage - Menlo Park, Calif. : Portola Institute, c1974. - 200 p. : ill. ; 33 cm. ISBN: 091477400X : $4.50 LCCN: 74081048 Subjects--Topical Terms: Power (Mechanics)Renewable energy sources.Energia renovável LC Class. No.: TJ153 / .E47848 Dewey Class. No.: 621.47