CFR > Title 36 - Parks, Forests, and Public Property > CHAPTER V—SMITHSONIAN INSTITUTION > PART 520—RULES AND REGULATIONS GOVERNING THE BUILDINGS AND GROUNDS OF THE NATIONAL ZOOLOGICAL PARK OF THE SMITHSONIAN INSTITUTION > 520.10—Placards, signs, banners, and flags.

520.10—Placards, signs, banners, and flags.

The displaying or carrying of placards, signs, banners, or flags is prohibited unless officially authorized.