Included are portage bills, insurance policies, bills, accounts, and correspondence relative to the Ships ARGO, CALEB GRIMSHAW, CHARLES H. MARSHALL, CITY OF NEW YORK, EXCELSIOR, JEREMIAH THOMPSON, JOSEPH WALKER, LADY FRANKLIN, LUCY THOMPSON, ORIENT, SARDINIA, STAR OF THE WEST, and TWILIGHT. There is also a large collection of general business accounts, bills, receipts, letters, and documents, as well as a small amount of information relative to personal property and investments by John W. and William P. Mason (the latter being one of the last officers of the company in the early 20th century. There is also 60 volumes; i.e. ledgers, letter copybooks, personal account and memorandum books, etc., which are relative to Samuel Thompson’s Nephew & Company’s business as conducted by the Masons. There are also two cashbooks belonging to Samuel Thompson, and four ledgers of Jeremiah Thompson. Of special significance is a letter copybook kept by Jeremiah Thompson containing a copy of a letter which details plans for the establishment of what was to become the famous Black Ball packet line between New York and Liverpool. A journal of a voyage by the Ship LUCY THOMPSON is also present.