Doris, Ellen, Doing what scientists do : children learn to investigate their world / Ellen Doris. - Portsmouth, New Hampshire : Heinemann, (c)1991. - xii, 194 pages : illustrations ; 26 cm. LCCN: 90048126 Subjects--Topical Terms: Science--Study and teaching (Elementary)--United States. LC Class. No.: LB1585 / .D656 1991 LB1585