LINUS PAULING - FIRST DAY COVER SIGNED CO-SIGNED BY: GEORGE PORTER, VINCENT DU VIGNEAUD, A.J.P. MARTIN, GLENN T. SEABORG, RONALD GEORGE WREYFORD NORRISH, LORD ALEXANDER R. TODD, DEREK BARTON, LARS ONSAGER, LUIS FEDERICO LELOIR - HFSID 283174

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