1. The 1989–1990 eruption of Redoubt Volcano, Alaska;Alaskan Volcano Observatory;EOS, Trans. Am. Geophys. Union,1990
2. The 1989–1990 eruption of Redoubt Volcano, Alaska;Alaskan Volcano Observatory;EOS, Trans. Am. Geophys. Union,1990
3. The 1989–1990 eruption of Redoubt Volcano, Alaska;Alaskan Volcano Observatory;EOS, Trans. Am. Geophys. Union,1990
4. Volcanic ash cloud shuts down all four engines of Boeing 747-400, causes $80 million in damage;AWST,1990
5. Aviation Weather Services (A supplement to Aviation Weather AC-00-6A), 1985, published by U.S. Department of Transportation and the U.S. Department of Commerce, Washington DC, 148 pp.