What is the township at longitude -100.680772?
CREATE TABLE "r" (
  "township" text,
  "county" text,
  "pop_2010" real,
  "land_sqmi" text,
  "water_sqmi" text,
  "latitude" text,
  "longitude" text,
  "geo_id" real,
  "ansi_code" real
);
SELECT "township" FROM "r" WHERE "longitude"='-100.680772';