At the time I looked it up, the site had no image for that grant. They have been posting images and it is available now. It also has a second page. This did not come from a book, but from a collection at the GA archives. I don't know where Sandy Run was, but Wilkes Co was divided into several counties and some of it was even part of a disputed area that later was found to be SC, if I am not mistaken.

http://cdm.sos.state.ga.us:8888/cdm4/document.php?CISOROOT=/...

Another 200 acres to Samuel Harper in 1784, Wilkes Co

http://cdm.sos.state.ga.us:8888/cdm4/document.php?CISOROOT=/...

And a third to Samuel Harper, also 200 acres in Wilkes Co

http://cdm.sos.state.ga.us:8888/cdm4/document.php?CISOROOT=/...

Hope this helps.