Perhaps you should try some spelling variations:
"case studies address marine history" » "case studies across marine history", "case studies areas marine history", "case studies address mariners history", "case studies address maritime history", "case studies address market history"
"dust reforms under class history" » "dust reform under class history", "dust reforms under crises history", "post reforms under class history", "past reforms under class history", "dust storms under class history", "dust reforms gender class history", "dust reforms upper class history", "dust reforms order class history"

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: (("case studies address marine history") OR ("dust reforms under class history"))~.
• Removing quotes may allow a broader search: (( case studies address marine history ) or ( dust reforms under class history ))~.
• Adding a wildcard symbol may retrieve word variants: (("case studies address marine history") or ("dust reforms under class history"))*.