TY - BOOK AU - Sagan,Carl AU - Druyan,Ann TI - El Cometa SN - 8408000128 U1 - 523.6 23 PY - 1992/// CY - Barcelona PB - Planeta, KW - Comets KW - Halley's comet N1 - Includes indexes; ELcometa carl Sagan - I COSMOS II Ann Druyan ER -