Don't discount this book because of its age or dull looking cover - it is a thorough stripped down and original analysis of every aspect of landscape painting, covered in detail. A great grounding in the subject.
The obvious let down is the illustrations and it's a shame it hasn't be done with these reinstated in colour or updated. However they are adequate for understanding the themes of the book and they shouldn't put you off.
The language sometimes reads a little stilted, but if you are serious about landscape painting, this book will amaze, surprise and reward your attention. I believe the very practical theories and ideas expounded and discussed will stay with you for life