While Denkmann was still alive the two gave substantial amounts of money to build the Rock Island Public Library.
The twelve authors carved into the sandstone are the last names of Homer, Henry Wadsworth Longfellow, Ralph Waldo Emerson, Virgil, Victor Hugo, William Shakespeare, Johann Wolfgang von Goethe, Robert Burns, Esaias Tegner, Alighieri Dante, Nathaniel Hawthorne, and George Bancroft.
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