Regulatory announcement 19 and 21. 21. Regulations relating to migratory birds and certain game mammals, 1947, [approved and proclaimed by the President July 27, 1944, 9 F. R. 9873, as last amended July 31, 1947, 12 F. R. 5269, and Aug. 21, 1947, 12 F. R. 5697].