Gary7,
You don't say what part of the country you are from. Trees you are likely to find vary a great deal in different regions. Trees in florida are different than trees in Maryland. For example the Tulip poplar so commmon in Maryland is rare and semi-coveted in Florida.
Most local clubs have a locally renowned wood identification member. Find your local version of Clark Davidson or Dave Barriger and ask them what books they reccomend for your area. Local Universities may have tree identification publications and maybe web sites to aid in regional identifications.
Another issue is yard trees where native tree books fail. In Maryland there were lots of non-native like Chinese Chestnut, Osage Orange, Redwoods, chinese elm and lots of others. In Florida this list seem endless.
Happy Turning,
Al