TY - JOUR A1 - Hoover, r. b. T1 - Comets, carbonaceous meteorites, and the origin of the biosphere JO - Biogeosciences Discuss. J1 - BGD VL - 3 IS - 1 SP - 23 EP - 70 Y1 - 2006/01/27 PB - Copernicus Publications SN - 1810-6277 UR - http://www.biogeosciences-discuss.net/3/23/2006/ L1 - http://www.biogeosciences-discuss.net/3/23/2006/bgd-3-23-2006.pdf ER -