When searching for names in Series III: Unpublished Materials of the Ulysses S. Grant Collection, the researcher must take note of the manner in which The Papers of Ulysses S. Grant editorial project maintained its files. Names of individuals who often corresponded with, for, or about General Grant were shortened to their initials for the sake of brevity. In most instances, these individuals will be found by searching for their initials (however, this may not always be the case; searching the individual's last name may yield additional results). A list of these individuals and their initials can be found here.
A video tutorial demonstrating how to use the database can be viewed here.