. . . . . . . . . . . "The Mainz Psalter of 1457 : the first printed book to bear a date, the first in which the printers are named, and the first in which a printers' mark appeared. Rarer than the \"Gutenberg\" Bible, the most perfect copy is preserved in the National Library at Vienna" . "The Mainz Psalter of 1457 : the first printed book to bear a date, the first in which the printers are named, and the first in which a printers' mark appeared. Rarer than the \"Gutenberg\" Bible, the most perfect copy is preserved in the National Library at Vienna"@en . . "The Mainz psalter of 1457" . . . . . "The Mainz Psalter of 1457" . "The Mainz Psalter of 1457 ... : the first printed book to bear a date, the first in which the printers are named, and the first in which a printers' Mark appeared rarer than the \"Gutenberg\" Bible, the most perfect copy is preserved in the National Library at Vienna"@en . "Bible. O.T. Psalms. Latin. 1457." . . . .