The Book of Dogs Louis Agassiz Fuertes and Others, National Geographic Society, USA, 1919 (Digitized by Cornell University)

In this book you will find, from the point of view of the US author, a thoroughly critical chapter on the Collie. In four lines he also mentions the Sheltie.
There is a coloured drawing by the author of the Collie, Old English Sheep-Dog and Smooth Collie.  

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