Perhaps you should try some spelling variations:
"die shells / http://id.loc.gov/authorities/names/n93002992" » "der shells / http://id.loc.gov/authorities/names/n93002992", "drift shells / http://id.loc.gov/authorities/names/n93002992", "die shells / http://id.loc.gov/authorities/james/n93002992"
"die shell / http://id.loc.gov/authorities/names/n93002992" » "die shell / http://id.loc.gov/authorities/james/n93002992"

Try widening your search to All Fields.

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: "((\"die shells / http://id.loc.gov/authorities/names/n93002992\") OR (\"die shell / http://id.loc.gov/authorities/names/n93002992\"))".
• Removing quotes may allow a broader search: (( die shells / http://id.loc.gov/authorities/names/n93002992 ) OR ( die shell / http://id.loc.gov/authorities/names/n93002992 )).
• Adding a wildcard symbol may retrieve word variants: (("die shells / http://id.loc.gov/authorities/names/n93002992") OR ("die shell / http://id.loc.gov/authorities/names/n93002992"))*.