Mike, the best I can tell from my research is my trees must be young hackberrys. I don't know for sure as the leaves are gone. Like everything, the web descriptions are all over the lot. USDA compares it to elm and ash. Others describes the wood as strong and one of the most flexible of hardwoods while others describing the wood as weak and brittle. They all seem to agree that aside from wildlife, the tree is basically only fit for firewood. The birds may like them but I hate their droopy branches - you wack them off so you can mow and before you can turn around the next ones up begin to droop.
Ron
Ron