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- 10 - with the result that a uniform basis for the constant scrutiny of the ability and proficiency of all airline pilots has been assured. THE SOURCES RELIED ON BY THE ADMINISTRATOR IN SUPPORT OF THE 1959 RULE 15. In 1959, the Administrator relied upon several geriatric, actuarial, medical and operational studies in support of the rule. In responses to ALPA's request for the "data, studies and material used in developing the proposed Rules," Mr. Quesada cited some 41 reference sources, which he listed in Exhibit 1 annexed to his affidavit submitted to the United States District Court for the Southern District of New York [Case No. 60 Civ. 296]. 16. There is good reason to question the validity and currency of several of those sources as a basis for the rule even as of 1959. Of these 41 sources, nearly 70% of them were, in 1959, ten years old or more, more than half of them were then 15 years old or more, and several of these sources were materials published prior to 1930. A source reference which was then 15 years