Perhaps you should try some spelling variations:
"one historian" » "one historical", "any historian", "de historia"
"a historian" » "a historical", "la historia", "a historic"
"_ historian" » "_ historians", "_ historical", "_ historic"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("a historian") OR ((("_ historian") OR ("one historian")))).
• Removing quotes may allow a broader search: (( a historian ) or ((( _ historian ) or ( one historian )))).
• Adding a wildcard symbol may retrieve word variants: (("a historian") or ((("_ historian") or ("one historian"))))*.