What is the original air date of the u.s. acres episode who done it?
CREATE TABLE "table1_1852270_6" (
  "episode" text,
  "garfield_episode_1" text,
  "u_s_acres_episode" text,
  "garfield_episode_2" text,
  "original_airdate" text
);
SELECT "original_airdate" FROM "table1_1852270_6" WHERE "u_s_acres_episode"='Who Done It?';