The book referred to is: Gray, Gertrude E., comp. Virginia Northern Neck Land Grants. 4 vols. Baltimore, Md.: Genealogical Pub. Co., Inc., 19871993. Z:221 probably refers to Land Book Z, p. 221. Images of the actual land grants can be viewed on the Virginia State Library web site at: http://www.lva.lib.va.us/ Brian