Mary Belin (1839-1913) married Lammot du Pont (1831-1884) and had eleven children, many who were prominent in the building up of the E.I. du Pont de Nemours & Company. The volume consists of a typed transcript of letters originally sent to Mary Belin du Pont (1839-1913) by her daughters Louisa ("La") (1868-1926), Sophie M. ("Tabby") (1871-1894), Isabella ("Bella") (1882-1946), and Margaretta ("Peg") (1884-1973) in 1894. The letters center around a single incident wherein Sophie, who was suffering from tuberculosis, was sent to Colorado Springs for a cure.

Irene "Sophie" Sophie du Pont May (1900-2001) was a churchwoman, a philanthropist, and a descendant of Pierre Samuel du Pont de Nemours (1739-1817) who founded the E.I. du Pont de Nemours & Company with his son Eleuthère Irénée du Pont (1771-1834) in 1802. The E.I. du Pont de Nemours & Company is a chemical company more commonly referred to as the DuPont company. The collection consists of Sophie du Pont May's family correspondence and financial correspondence as well as correspondence between her father Irénée du Pont (1876-1963) and his older sister Louisa d'Andelot du Pont Copeland (1868-1926).