The art of landscape painting in oil colour (1907)
East, Alfred, Sir, 1844-1913, author · London : Cassell and Company, Limited · leaf 113
63 TREES. … ON THE OUSE. One word more. The great advantage of painting your sky to suit your landscape (as described in another chapter) is that you can paint into the sub-tone, covering part and leaving part, and by so doing you advance that feeling of the movement of the leaves against the sky. You must, as…
Landscape painting
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.