CREATE TABLE table_name_23 (previous_conference VARCHAR, year_joined VARCHAR, ihsaa_class VARCHAR)

Which Previous conference has a Year joined smaller than 1976, and an IHSAA Class of A?
SELECT previous_conference FROM table_name_23 WHERE year_joined < 1976 AND ihsaa_class = "a"
SELECT "previous_conference" FROM "table_name_23" WHERE "a" = "ihsaa_class" AND "year_joined" < 1976