Information circular / University of Wisconsin, Wisconsin Geological Survey.

no.1 1955; no.1-3 1955-1956; no.3 1956; no.1-4 (1955-57); no.4 1959; no.4-6 1959-1965; no.9 1967; no.5-10 (1961-69); no.11-13 (1970); no.15-16 (1970); no.17-19 (1970-71); no.20-21 1972; no.22-25 1972-1974; no.23-27 (1974-75); no.28-34 (1975-76); no.35-39 (1977-81); no.40-44 (1982-83); no.46 1984 + Plate; no.46-49 (1984-85); no.47 1985 + Plates; no.48 1985 + Plate; no.51-52 (1986); no.55-58 (1986-87); no.59-63 (1987-89); no.64-69 (1988-91); no.68 1991; no.70-74 1991-1992, 1996; no.70-75 1992-96; no.11(1970); no.12(1970); no.13(1970); no.2(1956); no.4(1957); no.5(1961); no.6(1965); no.7(1966)