TY - BOOK AU - Harrah, E.C TI - North american monostomes primarily from fresh water hosts with nine plates and two tables U1 - 595 21st ed PY - 1922/// CY - Urbana Illinois PB - Zoological laboratory University of illions KW - monographes KW - families of monostomidae KW - new species previously described from north america N1 - Illinois biological monographs ER -