An edition of Observations and investigations made at the Blue Hill Meteorological Observatory, Massachusetts, U.S.A., in the years 1903 and 1904, under the direction of A. Lawrence Rotch (1906)

Observations and investigations made at the Blue Hill Meteorological Observatory, Massachusetts, U.S.A., in the years 1903 and 1904, under the direction of A. Lawrence Rotch

with an appendix on the errors of absorption hygrometers

By Abbott Lawrence Rotch,Edward C. Pickering