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68. "Orbital Debris and Meteoroid Population as Estimated from LDEF Impact Data". Presented at the LDEF Post-Retrieval Symposium, June, 1993, Williamsburg, Va. Jingchang Zhang, (Kessler). 67. "Modeling and Measurements of the Uncatalogued Orbital Debris Population". Presented at the Debris Course by the European Space Agency, Noordwijk, the Netherlands, November, 1992. 66. "Reduced Debris Hazard Resulting from A Stable Inclined Geosynchronous Orbit". Paper presented at COSPAR, World Space Conference, August 28-September 5, 1992, Washington DC. Published in Advances in Space Research, Vol. 13, No. 8, pp August, 1993. Co-authors L.J. Friesen, (Kessler), and H. A. Zook. 65. "Orbital Debris Environment in Low Earth Orbit: An author: