CREATE TABLE table_203_591 (id NUMBER, "high school" CLOB, "join\ year" CLOB, "from" CLOB, "left" CLOB, "league left to" CLOB)

list each of the high schools which joined in the year 1976 .
SELECT "high school" FROM table_203_591 WHERE "join\nyear" = 1976
SELECT "high school" FROM "table_203_591" WHERE "join\nyear" = 1976