"Tree Finder - A Manual for the Identification of Trees by their Leaves"; and ...............
"Winter Tree Finder - for identifying deciduous trees in winter", by May Theilgaard Watts & Tom Watts; ISBN: 0 912550-03-1
I have recommended this remarkable series of identification booklets previously.
I paid $2 many years ago; I think the price has increased dramatically to ~$4.
Very small simplistic looking "pocket" size booklet, but Don't underestimate it.
The series uses drawings & logic charts to quickly lead to an ID.
e.g. if yes, go here; if no, go there.
After an initial ID, I may get added info from lots of other tree references.
Example:
