[Highland Park] Book Wanted

I am doing some historical research on early petroleum pioneers in Pittsburgh, including Charles Lockhart and William Larimer Mellon of the East End. About 30 years ago, John Collins, Jr of Highland Park published a book entitled Stringtown on the Pike, which is out of print. It contains information that would be of value to me. If anyone has a copy they would be willing to sell, please let me know. Thanks. Al Mann 412-661-5947 alfredmann_6@msn.com