Papers in this collection relate mainly to Harriet Martineau and her niece, Maria Martineau. There are though records of other Martineau family members, including Thomas; Fanny Anne; Caroline; Susan; Rachel Anne; and W. Martineau. There are also a few items relating to the Chamberlain family, Joseph and his son Neville, and also to Sir George H. Kenrick, and their presence amongst the Martineau family papers perhaps reflects the close ties between the Martineau, Chamberlain, and Kenrick families.
Records within this collection include manuscripts, papers and pamphlets relating to Harriet Martineau's publications; correspondence to and from the Martineau family; legal and financial papers; photographs; sketch books; books of verse and poetry; travel maps and notes etc. Other miscellaneous items are also listed, including a more unusual item being a piece of hair and cerecloth cut from an Egyptian Mummy, accompanied by a note indicating that Harriet Martineau saw the hair cut from the head of a mummy at Thebes on the Nile in 1847. The hair and cloth is thought to date c 900BC but, that aside, the rest of the material within this Martineau family papers collection date 1813-c 1960s.