THIS IS A CHRISTIAN SPIRITUAL DOCUMENT. I HAVE FOUND SEVERAL BOOKS THAT DEALT WITH A ANSWER TO REVELATION 13:18 OF THE HOLY BIBLE. I HAVE HAD THIS ONE BOOK FOR OVER FIFTEEN YEARS. THIS IS THE BOOK THAT I USED. WITHOUT FURTHER ADIEU, I PRESENT IT TO YOU. THE ANSWER I USED IS FOUND IN " APOCALYPSE UNSEALED " BY JAMES MORGAN PRYSE. IT WAS SAID TO HAVE BEEN PUBLISHED IN 1910. THE BOOK IS ALSO KNOWN AS " THE APOCALYPSE UNSEALED BEING AN ESOTERIC INTERPRETATION INITIATION ST JOHN THE BOOK IS ALSO KNOWN AS THE BOOKS IDENTIFICATION NUMBERS ARE ISBN - 10: 1564593363 AND ISBN - 13: 978 - 1564593368.