Correspondence on the following topics: Laguna Dam, California - Arizona; Los Angeles Harbor; Los Angeles Municipal Railway; the decomposition of cement and concrete; the Paradise- Verde Irrigation District. Also correspondence and witness report forms about earthquakes occurring in Southern California in 1917. Also correspondence with the following organizations and bodies: Consolidation Committee of Los Angeles, Calif.; Los Angeles Harbor Commission; Municipal League of Los Angeles; Municipal Waterways Association.

Hamlin was the City Engineer of Los Angeles from 1906 - 1917.

(Boxes: 2 ½ legal)

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