What is Surface, when Date is less than 1979, and when Opponent in the Final is "Bill Scanlon"?
CREATE TABLE "wins_3" (
  "outcome" text,
  "date" real,
  "championship" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score_in_the_final" text
);
SELECT "surface" FROM "wins_3" WHERE "date"<1979 AND "opponent_in_the_final"='bill scanlon';