Annual obituary notices of eminent persons who have died in the United States 1857 & 1858 is a two volume set written by Natan Crobsy. These are freely available and searchable. Below is a section of the book’s introduction.
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Obituary notices of Eminent Persons 1857 to 1858
1857 Vol I [ digital copy ] [ searchable full text copy ]
1858 Vol II [ digital copy ] [ searchable full text copy ]