Nelson, W. J., DeMaris, P. J., & Bauer, R. A. (1987). The Hornsby district of low-sulfur Herrin coal in central Illinois (Christian, Macoupin, Montgomery, and Sangamon counties). Illinois State Geological Survey.
Chicago Style (17th ed.) CitationNelson, W. John, Philip J. DeMaris, and Robert A. Bauer. The Hornsby District of Low-sulfur Herrin Coal in Central Illinois (Christian, Macoupin, Montgomery, and Sangamon Counties). Champaign, Ill.: Illinois State Geological Survey, 1987.
MLA (9th ed.) CitationNelson, W. John, et al. The Hornsby District of Low-sulfur Herrin Coal in Central Illinois (Christian, Macoupin, Montgomery, and Sangamon Counties). Illinois State Geological Survey, 1987.
Warning: These citations may not always be 100% accurate.