Circular / State of Illinois, Dept. of Registration and Education, Division of the State Geological Survey.

no.51-100 1939-43; no.101-154 1943-49; no.155-193; no.194-224 1955-56; no.225-245 1957; no.246-262 1958; no.263-283 1959; no.284-310 1960; no.311-325 1961; no.326-341 1962; no.342-358 1963; no.345-351 1963; no.355 1963; no.359-378 1964; no.375; no.379-395 1965; no.393 1965; no.396-407 1966; no.408 1967; no.408-418 1967-1968; no.419-430 1968; no.431 1968; no.432-447 1968-1969; no.448-467 1970-1971; no.448-459 1970-71; no.460; no.462-463 1971; no.464-475 1971-72; no.468-475 1972; no.476-483 1973; no.476 1973; no.477-483 1973; no.484-486 1974; no.487 1974; no.484-497 1974-1976; no.498-502 1977-1978; no.501-507 1978-79; no.503-514 1978-1980; no.508-514 1979-80; no.515-523 1981; no.520 1981; no.521-528 1981-83; no.524-530 1982-1983; no.529-534 1983-85; no.531 plates; no.536-537 1985-86; no.531,536,538 1984-1987; no.532-534,539-540 1984-1985,1987; no.535 1989; no.541-549 1988-1991; no.550-556 1992-1994; no.556 1994; no.557 1996; no.557-559 1996-1997; no.558 1997; no.559 1997; no.560 2001; no.561 2003; no.562 2003; 569 2006