Vol. 3: editors, Victor Fischer, Michael B. Frank; associate editor, Dahlia Armon.
Vol. 4: editors, Victor Fischer, Michael B. Frank; associate editor, Lin Salamo.
Vol. 5: editors, Lin Salamo, Harriet Elinor Smith.
Vol. 6: editors, Michael B. Frank, Harriet Elinor Smith.
v. 1. 1853-1866
v. 2. 1867-1868
v. 3. 1869
v. 4. 1870-1871
v. 5. 1872-1873
v. 6. 1874-1875.
Mark Twain's letters by Mark Twain. ISBN 0520237722. Published by University of California Press in 1988. Publication and catalogue information, links to buy online and reader comments.