This letter book is one of the most complete collections of writing from 18th century America and provides a valuable glimpse into the life of an elite colonial woman living during this time period. Her writings detail goings on at the plantations, her pastimes, social visits, and even her experiments with indigo over several years. Many scholars consider this letter-book extremely precious because it describes everyday life over an extended period of time rather than a singular event in history. Eliza passed her letter-book onto her daughter Harriott, who in turn passed it to her daughter. The letter-book was passed down from mother to daughter well into the 20th century, at which point the Lucas-Pinckney family donated the letter-book to the South Carolina Historical Society.