In slipcase.
Volume 1. 1600-1627 : Letters no. 1-232
Volume 2. 1627-1640 : Letters no. 233-474
Volume 3. 1640-1656 : Letters no. 475-680.
The correspondence of James Ussher : 1600-1656. ISBN 9781874280897. Published by Irish Manuscripts Commission in 2015. Publication and catalogue information, links to buy online and reader comments.