CFR > Title 36 > Chapter II > Part 251 > Subpart A > Designation of Areas CFR > Title 36 > Chapter II > Part 251 > Subpart A > Designation of Areas Current as of: 2024 | Check for updates | Other versions § 251.23 Experimental areas and research natural areas Ask a legal question, get an answer ASAP!Click here to chat with a lawyer about your rights.