Schell, Stewart C. 1912- How to know the trematodes/ [by] Stewart C. Schell. - Dubuque, Iowa: W. C. Brown Co,. [1970] - vii, 355 p.: illus. 22 cm. - Pictured-key nature series . Bibliography: p. 332-341. ISBN: 0697048608 LCCN: 70089537 Subjects--Topical Terms: Trematoda--Identification. LC Class. No.: QL391.T7S3 1970 Dewey Class. No.: 595/.122