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Cornelius Jackson  2
Derbyshire gentleman
John Jackson  2
Derbyshire gentleman
William Jackson  1
Staffordshire gentleman
George Jeffreys  1
London acquaintance ?
Nathaniel Johnston  120
Yorkshire antiquary, whose brother Henry was employed by Dugdale as a clerk.
Henry Johnston  1
Dugdale's clerk, younger brother of Nathaniel
Francis Junius  7
German philologist