Pennsylvania's hardwood forests are among its most valuable resources. Black cherry from PA is famous around the world. The hardwood industry accounts for thousands of jobs and millions of dollars to the economy. It is good to know that there are scientists working hard on conserving and improving hardwood species. The Hardwood Tree Improvement & Regeneration Center at Purdue University http://www.htirc.org (with support from the USDA Forest Service)

Scientists at the center are doing basic and applied research on species such as black walnut, red and white oak, green ash, and many others. Most of their research results are directly available from the web site. This is very handy for students doing research projects and foresters looking for practical information. Here is an article entitled: Successful Stock Production for Forest Regeneration: What Foresters Should Ask Nursery Managers About Their Crops (and Vice Versa).
It's well worth a look.