Public information circular - Geological Survey of Wyoming.

4-5 (1976); 6 (1977); no.9 1978; 7-9 (1978-79); no.12-13 (1980); no.14 (1980); no.15 1980; no.9-10 1978-1981; no.15 1981; no.16-17 (1981-82); no.18-19 (1983); no.22 1983; no.20-24 (1983-85); no.24 1985; no.25-27 1986; no.25-29 1986-1990; no.29 1990; no.25-31 (1986-91); no.31 1991; no.32-33 1993-94; no.35 1996; no.36 1996; no.35-37 1996-97; no.39 1998; no.40 1998; no.41 2001; no.39-42 1998-2003; no.42 2003; no.43 2005