(a) "Danger area” means the following: (1) That area established, effective April 5, 1958, encompassing the Bikini and Eniwetok Atolls, Marshall Islands and which is bounded by a line joining the following geographic coordi- 189 30! N., 156° 00! 18° 30! N., 1709 00! 115 30' N., 1709 00! 115 30' N., 166, 16! biel Gi tl nates: 10° 15' N., 166° 16' E, 10° 15! N., 156° oo! E, (2) That area established, effective July 25, 1958, encompassing Johnston Island and which is a circle of 400 nautical miles radius centered at the following geographic coordinates: longitude 169° 31! 00' west and latitude 16° 45! O0O' North. (b) "HARDTACK test series" means that series of nuclear tests conducted and to be conducted by the Atomic Energy Commission and the Department of Defense at the Eniwetok Proving Ground and at Jchnston Island, within the danger areas as defined in paragraph (a) of this section, which tests began in April 1958 and will end at an announced time during the calendar year 1958, 2. Sec. 112.4 is amended as follows: Sec. 112.4 Prohibition. No United States citizen or other person who is within thé scope of this part shall enter, attempt to enter, conspire to enter ov remain in either of the defined danger areas (Sec, 112.3 (a)) during the continuation of the HARDTACK test series, concept with the express approval of appropriate officials of the Atomic Energy Commission or the Department of Defense. 3. The Part head of this part is hereby amended to read as follows: "“HARDTACK Nuclear Test Series, 1958", ~ 30 ~