P A Yeomans-Building a Keyline Dam at a Saddle (A Contour and Functional Plan-Enhanced) 1958
The enhanced image above of a Keyline (Saddle) Dam is the upper half of Fig 7 in The Challenge of Landscape* by P A Yeomans (Chapter IV: Land Shape).
Scanned in 2015 to a document by Geoffrey Booth for Keyline Archive. www.youtube.com/channel/UCUPgPJZAlkxt207sxcdp4DQ/about * Yeomans, P.A. (1958). The Challenge of Landscape. Sydney, NSW: Keyline Publishing Pty Ltd. (out of print) P A Yeomans-Building a Keyline Dam (25 min) 1960. www.youtube.com/watch?v=i5z5T378SM4 Š Allan J Yeomans (1984). Uploaded with permission.