A forest is Land with at least 10\% of its surface area stocked by trees of any size or formerly having had such trees as Cover and not currently built-up or developed for agricultural use (USDAFS 1989).
Other /More definition:
A Forest is Terrestrial ecosystem (biome) with enough average annual precipitation (at least 76 centimeters or 30 inches) to support growth of various species of trees and smaller forms of vegetation.
List of books: Forest

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