(6/12/98) "Asteroids, Meteoroids, Comets: Is There a Danger?": El Cajon Valley Gem & Mineral Society
(9/27/98) "Asteroids, Meteoroids, Comets: Is There a Danger?": San Diego Association for Rational Inquiry
(10/9/98) "Rocks and Minerals of the Space Age": San Diego Mineral and Gem Society
~~~ "The Independent Planetologist" goes on the internet. ~~~
(11/14/98) "Asteroids, Meteoroids, Comets: Is There a Danger?": Orion of San Diego
(1/28/99) "Global Warming: A Planetary Perspective": SDSU, Advanced Undergraduate Seminar
(2/10/99) "Geology: The Earth as a Planet": Honor Seminars of San Diego (Junior Program)
(3/06/99) "Basaltic Flooding of Planetary Landscapes": Riverside Astronomical Society
(3/12/99) "Basaltic Flooding of Planetary Landscapes": Orange County Astronomers
(3/24/99) "Asteroid and Comet Collisions with the Earth and Other Planets": Reuben H. Fleet Science Center, Eyes on the Universe Lecture Series
(5/14/99) "Geology: The Earth as a Planet": SDSU, Educational Growth Opportunities Program
(5/14/99) "Basaltic Flooding of Planetary Landscapes": Astronomical Society of the Desert
(5/21/99) "Basaltic Flooding of Planetary Landscapes": San Diego Astronomy Association
(6/11/99) "Basaltic Flooding of Planetary Landscapes": Los Angeles Astronomical Society
(7/09/99) "Collisions of Comets and Planets": South Bay Astronomical Society
(7/14/99) "Craters, Plains, Wrinkles and Gashes: The Near-Side Lunar Landscape": Reuben H. Fleet Science Center, Eyes on the Universe Lecture Series
(9/10/99) "Collisions of Comets and Planets": Orange County Astronomers
(9/15/99) "Mars: Where Did All The Water Go?": SDSU, Geology Lecture Series
(9/23/99) "Collisions of Comets and Planets": CSU Los Angeles, Physics & Astronomy Colloquium
(10/9/99) "Collisions of Comets and Planets": Astronomical Society of the Desert
(10/16/99) "Weathering of the Martian Landscape": Third Annual Starry Nights Festival
(10/29/99) "Evolution of the Galilean Satellites of Jupiter": SDSU, Astronomy Colloquium
(12/4/99) "Collisions of Comets and Planets": Inland
Geological
Society / Riverside Astronomical Society