Spiritual salt: or, A sermon on Matth. 5.13. Ye are the salt of the earth- - Porter, Thomas (Printed by T.R. & E.M. for Ralph Smith, at the signe of the blew Bible in Cornhill neer the Royal Exchange, 1651)
Annotation on Thomason copy: "June 3". - Reproduction of the original in the British Library. - Thomason, E.629[14]. - Wing (2nd ed.), P2998E