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Letter: Director of the Geophysical Laboratory to John Merriam - 14th October 1937
Praise for Perret's work. Support for further financial resource to continue working on the Montserrat activity.
Telegram: Merriam to Perret - 8th October 1934
Carnegie institution of Washington grants Perret $2000 for continued studies on Montserrat.
Earthquake monitoring on Montserrat: Cost of retaining measuring instruments used by a Royal Society expedition
Discussions around instrumentation for monitoring earthquake activity on Montserrat in the 1930's. A mixture of typed and hand written communication.Includes the Royal society expedition report and reports from the volcano-seismological station on…