Which Year(s) of manufacture has a Quantity larger than 39, and a Type of 1′c1′ h2t?
CREATE TABLE "tank_locomotives" (
  "class" text,
  "railway_number_s" text,
  "quantity" real,
  "year_s_of_manufacture" text,
  "type" text
);
SELECT "year_s_of_manufacture" FROM "tank_locomotives" WHERE "quantity">39 AND "type"='1′c1′ h2t';