Draft of Harold Clayton Urey obituary for Icarus

Draft of obituary written by Sagan for one of his mentor's Harold Clayton Urey. Sagan discusses Urey's contributions to the field of planetary science and recounts how he met Urey while he was a student at the University of Chicago in 1952. This draft contains a significant number of cross outs and rewrites. The final version of the obituary was published in Icarus, volume 48, issue 3, p. 348-352