Before revision:  We develop a Bayesian method for automated probabilistic record linkage and show it recovers 40 \% more true matches, holding accuracy constant, than comparable methods in a matching of Union Army recruitment data to the 1900 US Census for which expert-labelled true matches are known .
After revision:  We develop a Bayesian method for automated probabilistic record linkage and show it recovers more than 50 \% more true matches, holding accuracy constant, than comparable methods in a matching of Union Army recruitment data to the 1900 US Census for which expert-labelled true matches are known .