20160731 frey50 Exploring the universe - North Americam ed. - Milwaukee, WI World Almanac Library ., 2001. - 61 p. : ill. (some col.) ; 29 cm. - 21st century science . ISBN: 0836850017 (lib. bdg.) LCCN: 2001031442 Subjects--Topical Terms: AstronomyCosmologyAstronomy.Universe. Dewey Class. No.: j520 Exp 25