Some young trees were planted close to curb outside school playground. I wondered what kind they were, and found a site that can help one find name of a tree by the characteristics of its leaves. All varieties listed are those of Ohio. I was able to find a picture of leaves very similar to those of the young trees I was interested in.
Perhaps other members might enjoy browsing the site.

http://www.oplin.lib.oh.us/products/tree/