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spec: States and Mexico , or other Federal agency , to cooperate with a representative or representatives of the Government of Mexico in a study regarding the equitable use of the waters of the lower Rio Grande and the lower Colorado and Tia Juana Rivers , for the purpose of obtaining information which may be used as a basis for the negotiation of a treaty with the Government of Mexico relative to the use of the waters of these rivers and to matters closely related thereto . Among the selections they played was Alegretto IFIPiense , composed especially for the Congress ( to be described in a future IFIP Newsletter ) .