I grew up in Alliance. You might be interested to know that Rockhill is a very prominent name there. There's Rockhill Elementary School; there's also a street called Rockhill. The library there has a website, www.rodmanlibrary.com. Go to the Reference section and click on the genealogy link. You can link to the Alliance Genealogical Society from there (and find lots of other info). With a name like Rockhill, I know you'll find something.