Perhaps you should try some spelling variations:
"dunn, nathan / 1782-1844 / zoological collections" » "dunn, nathan / 1782-1844 / biological collections", "dunn, nathan / 1782-1844 / ecological connections", "dunn, nathan / 1782-1844 / genealogical collections"
"dunn, nathan / 1782-1844 / colonial collections" » "dunn, nathan / 1782-1844 / biological collections", "dunn, nathan / 1782-1844 / cultural collections", "dunn, nathan / 1782-1844 / special collections"

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