. . "1972"^^ . . "The 1972 AMA Motocross Championship season was the 1st AMA Motocross National Championship season."@en . . . . . . . . . "1972 AMA Motocross National Championship season"@en . . . . . . "AMA Motocross National Championship season"@en . . . . . . . . . . . "1059342134"^^ . . . . . "The 1972 AMA Motocross Championship season was the 1st AMA Motocross National Championship season."@en . . . . . . . . . . . . "1972"^^ . . . . . . . . . . . . "10507"^^ . "2016-02-11"^^ . . . . "2016-02-13"^^ . . "49439709"^^ . . . . . . . . "AMA Motocross Championshipseason"@en . . . "AMA Motocross Championship season"@en . . . . . . . . . . . .