Years ago I bought a book which was part of a series of ‘Field Study Guides’ I was attracted by the dustcover which was covered with line drawings. The title was ‘Oaks and Oak Woods’ and the author was A.E.R.Ennion who was the warden of the field study centre at Flatford Mill in Suffolk. I still treasure my copy because it is illustrated with coloured line and wash drawings. He also wrote ‘The Lapwing’ which was the first book in the series.The books have long been out of print and I didn’t realise until quite recently that he was one of the most influential 20th century wild life painters. Robert Gillmor described him as "... a man of great humanity, intelligence, energy and fun."
The following links to pages on his website show examples of his watercolours.