Perhaps you should try some spelling variations:
"letters from a farther in pennsylvania" » "letters from a further in pennsylvania"
"letter from a farther in pennsylvania" » "letter from a further in pennsylvania"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"letters from a farther in pennsylvania\") OR (\"letter from a farther in pennsylvania\"))".
• Removing quotes may allow a broader search: (( letters from a farther in pennsylvania ) OR ( letter from a farther in pennsylvania )).
• Adding a wildcard symbol may retrieve word variants: (("letters from a farther in pennsylvania") OR ("letter from a farther in pennsylvania"))*.