Which issue was the Spoofed title Route 67 for which Mort Drucker was the artist?
CREATE TABLE "1960s" (
  "spoofed_title" text,
  "writer" text,
  "artist" text,
  "issue" real,
  "date" text
);
SELECT SUM("issue") FROM "1960s" WHERE "artist"='mort drucker' AND "spoofed_title"='route 67';