Georgia Archives has several land grants for Samuel Harper. Only see this one on Sandy Run:

Title Harper, Samuel
Last Name Harper
First Name Samuel
County Wilkes
Number of Acres 250
Watercourse Sandy Run
Year 1784
Volume Q
Page 139
Record ID 24075
Cite as Georgia Colonial and Headright Plat Index, 1735-1866
Author Abbe, Mary H.
Publisher R. J. Taylor, Jr., Foundation and The Georgia Archives.
Collection Georgia Colonial and Headright Plat Index

I can get images of some of the other grants, but not this one. Hope this helps.