Doyle, William T. The biology of higher cryptogams [by] William T. Doyle. - London Macmillan [c1970] - vii, 163 p. illus. 24 cm. - Current concepts in biology . 920313 Bibliography: p. 149-154. LCCN: 73084436 //r87 Subjects--Topical Terms: Cryptogams. LC Class. No.: QK505 / .D58 Dewey Class. No.: 586