Tree Guide
Dear Jos
I have long used Alan Mitchell's 'A Field Guide to the Trees of Britain and Northern Europe' (Collins, 1974) which is excellent, if lacking in more recent information, changes in nomenclature etc. It's a really usable pocket field book, with exceptionally good illustrations, and concise helpful information.
I use it in conjunction with Oleg Polunin's 'Trees and Bushes of Europe' (OUP, 1976) which has better cover of southern Europe, and photographs, which are often helpful.
There is, however, a wonderful new, if rather large volume, which feels like a companion to Blamey/Grey-Wilson's 'An Illustrated Dlora of Britain and Northern Europe (Hodder & Stoughton, 1989) [which is, itself, extremely good on trees of that region] which I have seen. I believe it is published by Cassell, who now publish the Blamey/Grey-Wilson, I think. It is not a pocket field book, but a beautiful reference work. Sorry not to have the author and title.
Best wishes
David