What is the number of the tax supervising and conservation bill?
CREATE TABLE "1932_general_election" (
  "meas_num" real,
  "passed" text,
  "yes_votes" real,
  "no_votes" real,
  "pct_yes" text,
  "const_amd" text,
  "type" text,
  "description" text
);
SELECT MIN("meas_num") FROM "1932_general_election" WHERE "description"='Tax Supervising and Conservation Bill';