Clara had a serious accident as a child while riding a toboggan; she was hurled into a tree, resulting in a severe leg injury that almost led to amputation.

[14] Charles Edmund Wark (1876-1954) was a classical pianist from Cobourg, Ontario, and he became Clemens' piano accompanist from the winter of 1906 to late in 1908.

[16] On May 30, Clemens debuted in London at a benefit concert, raising money for American girls to attend Oxford and Cambridge Universities.

[2][17] Clemens went for a sleigh ride on December 20, 1908, with Russian concert pianist Ossip Gabrilowitsch who was staying with her father at his residence "Innocents at Home" in Redding, Connecticut.

[18] Twain biographer Michael Shelden doubts the truth of this heroic tale and suggests that the story was planted in the press to quiet rumors that Clara was having an affair with Charles Wark, her former accompanist and a married man.

[22] He also said that the marriage was sudden because Gabrilowitsch had just recovered from a surgical operation which he had undergone in the summer and they were about to head off to their new house in Berlin where he would begin his European season.

[22] Samuel Clemens died on April 21, 1910, leaving his estate to be equally divided between his surviving daughters in a will dated August 17, 1909.

[23] Clara inherited the entire estate, which provided quarterly payments of interest to keep it "free from any control or interference from any husband she may have.

[27] On April 23, 1926, Clara played the title role in a dramatization of Twain's 1896 novel Personal Recollections of Joan of Arc at Walter Hampden's Broadway theater.

[35] She objected in 1939 to the release of her father's Letters from the Earth, but she changed her stance and allowed them to be published shortly before her death on November 20, 1962.