Perhaps you should try some spelling variations:
http://id.loc.gov/authorities/names/n93002992" » https://id.loc.gov/authorities/names/n93002992"
http://id.loc.gov/authorities/james/n93002992" » https://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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("(uni or unit) shells / http://id.loc.gov/authorities/names/n93002992") OR ("(uni or unit) shells / http://id.loc.gov/authorities/james/n93002992")).
• Removing quotes may allow a broader search: (( (uni or unit) shells / http://id.loc.gov/authorities/names/n93002992 ) or ( (uni or unit) shells / http://id.loc.gov/authorities/james/n93002992 )).
• Adding a wildcard symbol may retrieve word variants: (("(uni or unit) shells / http://id.loc.gov/authorities/names/n93002992") or ("(uni or unit) shells / http://id.loc.gov/authorities/james/n93002992"))*.