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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. 36. L.P. Keller, S. Messenger, G.J. Flynn, S. Clemett, S. Wirick, and C. Jacobsen, “The Nature of Molecular Cloud Material in Interplanetary Dust,” Geochimica et Cosmochimica Acta 68(11): 2577-2589, 2004. 37. L. Nittler, Carnegie Institution of Washington, personal communication, 2003. 38. J. Aleon, F. Robert, M. Chaussidon, and B. Marty, “Nitrogen Isotopic Composition of Macromolecular Organic Matter in Interplanetary Dust Particles,” Geochimica et Cosmochimica Acta 67: 3773-3783, 2003. 39. See, for example, S. Messenger, “Identification of Molecular-cloud Material in Interplanetary Dust Particles,” Nature 404: 968-971, 2000. 40. See, for example, F.J.M. Rietmeijer and P. Jenniskens, “Recognizing Leonid Meteoroids Among the Collected Stratospheric Dust,” Earth, Moon, and Planets 82-83: 505-524, 1998.
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