. . . . . . . . "Controversial literature"@en . . "Church Unity. Studies of its most important problems"@en . . . . . . . . . . "History"@en . . . . "Church Unity : studies of its most important problems" . . "Church unity : Studies of its most important problems" . . . . "Church unity studies of its most important problems"@en . . "Church unity : studies of its most important problems" . "Church unity : studies of its most important problems"@en . . "Leading Presbyterian scholar and professor at Union Theological Seminary, Briggs became an Episcopalian as a result of repeated challenges to his orthodoxy."@en . . . . . . . . . . . . . . "1800 - 1899" . .