Roberts, Paul, 1917-1967. Understanding grammar. - New York, Harper [c1954] - 550 p. 22 cm. Includes bibliography. ISBN: 0435105027 LCCN: 54005158 Subjects--Topical Terms: English language--Grammar--Problems, exercises, etc. LC Class. No.: PE1111 / .R74 Dewey Class. No.: 425