Invoice from Sigma Chemical Company to Sydney Brenner, 4/2/1956
Letter from F. H. Barnett to Sydney Brenner #1, 18/01/1956
Letter from F. H. Barnett to Sydney Brenner #2, 1956
Letter from F. H. Barnett to Sydney Brenner #3, 25/01/1956
Letter from F. H. Barnett to Sydney Brenner #4, 25/01/1956
Letter from F. H. Barnett to Sydney Brenner #5, 25/01/1956
Letter from Sydney Brenner to F. H. Barnett, 15/02/1956
Worthington Biochemical Corporation invoice for Sydney Brenner #1, 7/2/1956