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Journal
Lancet
Volume
2
Issue
7525
Pages
1056-9
Publication year
1967
Suggested citation
Ashcroft MT, Singh B, Nicholson CC, Ritchie JM, Sorryan E, Williams F. A seven-year field trial of two typhoid vaccines in Guyana. Lancet. 1967; 2(7525): 1056-9.
PMID
4168536