Letter from Z. Chandler to John William Dawson, written from Washington.

Letter from Joseph Henry to John William Dawson, written from Washington.

Letter from Hermann Ohm to John William Dawson, written from Washington, D.C..

Letter from Spencer F. Baird to John William Dawson, written from Washington, D.C.

Letter from W.H. Dall to John William Dawson, written from Washington.

Letter from Julian Pauncefote to George Mercer Dawson, written from British Embassy, Washington.

Letter from Isaac P. Noyes to John William Dawson, written from Washington, D.C.

Letter from W.J. McGee to George Mercer Dawson, written from Washington, D.C..

Letter from Lester F. Ward to John William Dawson, written from Washington DC.

Letter from Spencer F. Baird to John William Dawson, written from Washington, D.C..