what is the ship types delivered when the total vessels built for usmc is 13 ships for usmc (plus 37 more for usn)?
CREATE TABLE "yards_on_the_gulf_coast" (
  "yard_name" text,
  "location_city_state" text,
  "1st_ship_delivery_date" text,
  "ship_types_delivered" text,
  "total_number_of_ways" text,
  "total_vessels_built_for_usmc" text
);
SELECT "ship_types_delivered" FROM "yards_on_the_gulf_coast" WHERE "total_vessels_built_for_usmc"='13 ships for usmc (plus 37 more for usn)';