I have plotted virtually all of the original land grants for Harford County. Many of them are recorded as Baltimore County, from which Harford County was formed in 1773.
From the beginning, I have used DeedMapper from Direct Line Software to plot all these patents and various other deeds and surveys. The following files may be downloaded to be used with DeedMapper. I suggest that you first create a new folder on your computer. Download the following three files into the new folder by right-clicking on each one in turn and choosing Save Link or Download. Once that's done the zip file needs to be extracted into the same folder.
If you have any questions, please e-mail them to firstname.lastname@example.org