Sears, Paul B. Charles Darwin : the naturalist as a cultural force / Paul B. Sears. - New York : Charles Scribner's Sons, c1950. - ix, 124 pages ; 21 cm. - Twentieth century library . Includes bibliographical references and index. Subjects--Personal Names: Darwin, Charles, 1809-1882. LC Class. No.: QH31.D2 / S4 Dewey Class. No.: 925.9 SEA