In the field of author signatures, autographs and signed letters, there is generally a direct relationship between the popularity of an author during his/her lifetime and the availability of their signed pieces today. Popular authors carried on correspondences. People went to their readings and obtained their autograph signatures, and everyone saved their autographs and signed letters because they knew they were important. Authors who were not popular during their lifetimes, and were not appreciated until decades later, are quite rare in autograph signatures and signed letters today, because people did not recognize their names in the decades after they died and did not save their signatures and signed letters. In American literature, autograph signatures and signed documents of Nathaniel Hawthorne are rare, while those of Edgar Allan Poe and Herman Melville are in the very to extremely rare category. Henry David Thoreau would be, as well, if it were not for the fact that autograph manuscript pages of his were tipped into a specially issued collection of his works. These are the only pieces in his handwriting that are ever encountered. Popular writers of the same period – Henry Wadsworth Longfellow, John Greenleaf Whittier, Oliver Wendell Holmes – are all readily available today in autograph signatures and signed letters. Emily Dickinson, the reclusive poet, is extremely rare in any autograph examples. Walt Whitman is less rare and was quite popular during his lifetime, but he has been extensively collected by specialized collectors who have given or sold their collections to institutional libraries.