Perhaps you should try some spelling variations:
ethnological collections » biological collections, zoological collections, archaeological collections
2f ethnological » _ ethnological, 14 ethnological, 1844 ethnological
2c nathan » c nathan, _ nathan, 3 nathan
2f 1782 » 20 1782, 21 1782, 23 1782

Try widening your search to All Fields.

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• Adding a wildcard symbol may retrieve word variants: %22Dunn%2C Nathan %2F 1782-1844 %2F Ethnological Collections%22*.