The Louisbourg collection consists of five volumes relating to the expedition against Cape Breton in 1745-1746. Included are copies of instructions to Sir William Pepperrell, records of councils of war, copies of letters written on the expedition, and copies of letters to or from William Shirley, Benning Wentworth, Samuel ("Brigadier") Waldo, William Pitt, and others.
This collection is closely related to The William Pepperrell Papers, also available from the Massachusetts Historical Society series.