What was a common first team at the 1967 Mexican Grand Prix and 1971 US one?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/1967_Mexican_Grand_Prix> <http://dbpedia.org/property/firstTeam> ?uri. <http://dbpedia.org/resource/1971_United_States_Grand_Prix> <http://dbpedia.org/property/firstTeam> ?uri . }
1967_Mexican_Grand_Prix 1971_United_States_Grand_Prix