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This guide shows several ways in which you may search for translations.
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Index Translationum This database contains information about books translated and published in some 100 of UNESCO's Member States since 1979 in all disciplines.
When searching, combine author (and words from the title) and the target language.
The printed version covers the period of 1932-1986:
Index translationum. Répertoire international des traductions. International bibliography of translations. Ref Z6514.T7I42 Porter. Library has: (1949)-18 (1965), 20 (1967)-39 (1986)
Index translationum. Répertoire international des traductions. International bibliography of translations. no. 1-31; July 1932-1940. (Kraus Reprint) Ref Z6514.T7I4 Porter. Library has: no. 1-26