Perhaps you should try some spelling variations:
"occasional maps series; 10" » "occasional war series; 10", "occasional map series; 10"
"occasional cass series; 10" » "occasional war series; 10"
"occasional papers series; 10" » "occasional paper series; 10", "occasional paperback series; 10"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("occasional papers series; 10") or ((("occasional maps series; 10") OR ("occasional cass series; 10"))))) or ("((occasional maps) or (occasional paper)) series; 10"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("occasional papers series; 10") OR ((("occasional maps series; 10") OR ("occasional cass series; 10"))))) OR ("((occasional maps) or (occasional paper)) series; 10")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"occasional papers series; 10\") or (((\"occasional maps series; 10\") OR (\"occasional cass series; 10\"))))) or (\"((occasional maps) or (occasional paper)) series; 10\"))".
• Removing quotes may allow a broader search: (((( occasional papers series; 10 ) or ((( occasional maps series; 10 ) OR ( occasional cass series; 10 ))))) or ( ((occasional maps) or (occasional paper)) series; 10 )).
• Adding a wildcard symbol may retrieve word variants: (((("occasional papers series; 10") or ((("occasional maps series; 10") OR ("occasional cass series; 10"))))) or ("((occasional maps) or (occasional paper)) series; 10"))*.