sO OFFICIAL USE ONLY -2- were level for many feet, i.e., they were not collected from either a crest or a depression. Water - three, one liter samples of lagoon water were taken from each of four areas: off of Rabelle, Labaridj and Rongelap {slands in Rongerlap Atoll and from Ailinginae Lagoon. Copy of this letter is being sent to Dr. Charles Dunham. Very truly yours, AHS:cef ec: A. H. SEYMOUR Charles Dunham Chief, DBM, Wash., D.C. L. R. Donaldson Dir., AFL, Univ. of Wash. OFFICIAL USE ONLY COPY 906199)

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