Across the country people are beginning to realize that children need to have deep and meaningful experiences with the natural world while they are growing up. Without these experiences, children will miss a dimension of happiness; may find no real relief from the stresses of civilization; and most importantly, may not realize that there is any natural world that needs to be protected.
Here is a portal to an Oklahoma botanist .
Here are some of his books:
Encyclopedia of Science and Technology
Encyclopedia of Biodiversity