Letter from Alfred Clarke to B.J. Harrington, written from New York.
Letter from S. Braeunlich of the Scientific Publishing Company to B.J. Harrington, written from New York. Letter regarding a French edition of Dr. Hunt's Systematic Mineralogy.
Letter, 1 March 1869
Letter, 1 October 1879
Letter, 1 July 1878
Letter, 1 March 1887
Letter, 1 February 1883
Letter from S. W. Ford to B.J. Harrington regarding obituary of Billings.