The Journal of Discourses (often abbreviated JOD, or sometimes as J.D.) is a 26-volume collection of public sermons by early leaders of The Church of Jesus Christ of Latter-day Saints. The first editions of the Journal were published in England by George D. Watt, the stenographer of Brigham Young. Publication began in 1854, with the endorsement of the church's First Presidency, and ended in 1886.
The Journal of Discourses is considered semi-authoritative. (Search scanned copies at BYU here; text only here at Wikisource.)