The collection consists of correspondence and other material by and about the American author and adventurer Henry Wikoff. Most of Wikoff's letters are addressed to his friend and relative Charles I. Hendrickson, but some are addressed to Hendrickson's daughter "Tillie" or Matilda Hendrickson. Three of Wikoff's early letters (1839) to Hendrickson were written while both men were in Paris. In other letters from the 1860s and 1870s, Wikoff writes to Hendrickson about his frequent travels to Europe, the people he meets, and books he is writing, and he inquires about family and friends back home. One letter of Tillie's mother and two letters of Joanna Neuell are about being invited for parties and dinners by Mrs. Abraham Lincoln as Wikoff was a friend of Mrs. Lincoln. There is a letter by Agnes E. Brunning to Mrs. Julia Hendrickson informing her of Henry Wikoff's death on April 28, 1884. There are two portrait engravings: one of the Comte d'Orsay, inscribed to Wikoff by the Comte, and another of Wikoff by P. C. van Geel, dated 1836. Included are a carte-de-visite photograph of Wikoff by the New York firm of Charles D. Frederick and Co. and a photograph of the family home "Locustwood" built by Hendrickson in Middletown, New Jersey. Also included are a small bankbook of Wikoff and several loose sheets showing George H. Wikoff's financial transactions with Henry Wikoff, with entries dated from April 1839 to January 1846.