The book has a lot of good information, but the style is a bit dated. It's a lot of the basic ideas of number theory - prime numbers, etc - but the format makes it a little difficult to follow, since ... Read More
Manual of the Trees of North America (Exclusive of Mexico).
The problem with most tree books is they only have "the most common" species. But if you are serious about trees, you already know the hundred or so common ones, or you can narrow it down at least to ... Read More