upper right in image: No 77 / Borthwich Castle from y SW / JC (in monogram)
Donald Vogler, Portland, OR; gift to NGA, 2017.
- Lumsden, E.S. "The etchings of John Clerk of Eldin." Print Collector's Quarterly 12 (1925): no. 69, ii/ii
- Bertram, Geoffrey. The Etchings of John Clerk of Eldin. Taunton, 2012: no. 91, iv/iv