lower left in plate: No. 73; Clackmannan Tower from the South West; lower right in plate: JC (in monogram) 1775
(Campbell Fine Art, London, 10 March 1998); 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. 55
- Bertram, Geoffrey. The Etchings of John Clerk of Eldin. Taunton, 2012: no. 62