What ship types were first delivered in December 1942?
CREATE TABLE "yards_on_the_great_lakes" (
  "yard_name" text,
  "location_city_state" text,
  "1st_ship_delivery_date" text,
  "ship_types_delivered" text,
  "total_number_of_ways" text
);
SELECT "ship_types_delivered" FROM "yards_on_the_great_lakes" WHERE "1st_ship_delivery_date"='december 1942';