CREATE TABLE table_19157 ("High School" CLOB, "Type" CLOB, "Established" FLOAT, "Enrollment" FLOAT, "Mascot" CLOB, "WIAA Classification" CLOB, "Notes" CLOB)

What's the note about the school established in the year of 1973?
SELECT "Notes" FROM table_19157 WHERE "Established" = '1973'
SELECT "Notes" FROM "table_19157" WHERE "Established" = '1973'