Laws and Regulations Emergency Determination of Critical Habitat for Mississippi Sandhill Crane; 40 FR 27501 27502 (Grus canadensis pulla)Jun 30, 1975Document Citation40 FR 27501 Mississippi Sandhill Crane, Determination of Critical Habitat; 40 FR 40521 40522 (Grus canadensis pulla)Sep 3, 1975Document Citation40 FR 40521