In south Jersey, look for osage on the farms in your area. Delaware has lots of it. Should be plenty of black locust, green ash (white ash is better than green ash, too-it's used in baseball bats), american elm, mockernut hickory. You might find persimmon, hackberry, or red (slippery) elm also. You have to be careful with common names of trees, for instance, iron wood is a different tree in different parts of the country. Some areas it's ostrea virginiana (muscle wood, found in swampy areas), others it's carpinus carolinana (hop hornbeam). Same common name, totally different species.