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1 April 19*5 For services* , ,$500.00 (l) It le hereby certified that this Is Invoice Ko. Z applying to Subproject 30 of Project KKOLTRA, that performance was satis factory, that the services were accos^llsbsd in accordance with mutual agree&eats, that a detailed agenda of the payments and receipts are on file in TSS/CD, that this bill is just and cor- rest and that payment thereof has not yet boon made. Research Director