What zone has camp type D/S in area Bl9?
CREATE TABLE "grand_canyon_zoning_and_use_limits" (
  "area" text,
  "name" text,
  "zone" text,
  "group_s" real,
  "parties" real,
  "max_people" real,
  "camp_type" text
);
SELECT "zone" FROM "grand_canyon_zoning_and_use_limits" WHERE "camp_type"='d/s' AND "area"='bl9';