Materials include an original letter from John K. Kane to Thomas L. Kane. The letter is incomplete, but it mentions a business trip to Washington, includes an update about the presidential race, and talks about arrangements being made by the United States government to pay back a forty million dollar debt. Dated December 1843.

Materials include an original letter from Robert Patterson Kane to Thomas L. Kane. Robert says he sent twenty-four bulletins and he tells Tom about changes to the United States Coast Survey. He says that Alexander Dallas Bache's will be in charge of ten brigades instead of one. Dated December 24, 1843.

Materials include an original letter from John K. Kane, John Kent Kane, and William Leiper Kane to Thomas L. Kane. They say they have written several letters which have not been delivered properly. John encourages Thomas to take a trip to the Mediterranean, suggesting Italy, and offering him some money for the travel expenses. Dated January 25, 1844.

Materials include an original letter from John K. Kane, Jane Duval Leiper Kane, and Robert Patterson Kane to Thomas L. Kane. In the letter they write about how Martin Van Buren's presidential prospects continue to brighten and they give him an update of recent local and national political news. Dated February 15, 1844.

Materials include an original letter from John K. Kane to Lt. Henry Morris replying to a previous letter. The reply mentions the annexation of the bill of landing for a second small box and it says that the navy has ordered Captain Isaac McKewer to join the East India Squadron. It is written on the back of one of the pages from Morris's original letter. Dated April 14, 1844.

Materials include an original letter from John K. Kane to Jane Duval Leiper Kane giving an outline of his agenda since arriving in Harrisburg, Pennslyvania, on Tuesday night. Dated January 29, 1845.

Materials include an original letter from John K. Kane to Thomas L. Kane saying that he is occupied with the presidential inauguration in Harrisburg, Pennsylvania . Dated January 20, 1845.

Materials include an original letter from John K. Kane, in which John says he hopes to visit the South next week. Dated February 20, 1845.

Materials include an original letter from John K. Kane and Jane Duval Leiper Kane to their son Thomas L. Kane pleading with him to remember his health. He tells him about Elisha's travels and talks about current events in England. Dated May 11, 1845.

Materials include an original letter from John K. Kane to Thomas L. Kane, instructing the latter to call on his client and inform him that John will not be in the office until Tuesday. Dated January 3, 1846.