Letter from Alexis A. Julien to B.J. Harrington, written from New York.
Letter from Alfred Clarke to B.J. Harrington, written from New York.
Letter from Alfred Clarke to B.J. Harrington, written from New York.
Letter from A.S. Bickmore to B.J. Harrington.
Letter from Becker & Sons to B.J. Harrington, written from New York. Letter regarding order of analytical balance and weights.
Letter from Benjamin Thompson, 18 January 1786
Letter from Benjamin Thompson, 18 January 1786
Letter from C. Kirchhoff to B.J. Harrington, written from New York.
Letter from Century Co. Publishers to Palmer Cox
Letter from Century Co. Publishers to Palmer Cox
Letter from Charles J. Morrison, 22 October 1800
Letter from Charles J. Morrison, 22 October 1800
Letter from Chas.A. Bunting to B.J. Harrington.