who was the president of the us in 1971?
(JOIN (R government.government_position_held.office_holder) (AND (JOIN government.government_position_held.time_macro 1971^^http://www.w3.org/2001/XMLSchema#date) (AND (JOIN government.government_position_held.office_position_or_title m.060d2) (JOIN (R government.government_office_or_title.office_holders) m.060d2))))