Perhaps you should try some spelling variations:
"abhandlungen und nationalokonomie" » "abhandlungen der nationalokonomie", "abhandlungen fur nationalokonomie", "handlungen und nationalokonomie", "abhandlungen uber nationalokonomie", "abhandlungen aus nationalokonomie"
"verhandlungen und nationalokonomie" » "verhandlungen der nationalokonomie", "verhandlungen fur nationalokonomie", "verhandlungen des nationalokonomie"

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