. . . . . . "A sixth letter, concerning the sacred Trinity : in answer to a book entituled, Observations on the four letters, &c" . . "A sixth letter, concerning the sacred Trinity; in answer to a book, entituled: Observations on the four Letters, etc"@en . "Early works"@en . . . "Early works" . . . . . "A sixth letter, concerning the sacred Trinity; in answer to a book entituled, Observations on the four letters, &c. By John Wallis, D.D. Professor of Mathematicks in Oxford"@en . "Controversial literature"@en . . "A sixth letter, concerning the sacred trinity : in answer to a book entituled, Observations on the four letters, &c"@en . . . . "A sixth letter, concerning the sacred Trinity in answer to a book entituled, Observations on the four letters, &c"@en . "A sixth letter, concerning the sacred Trinity in answer to a book entituled, Observations on the four letters, &c" . .