Extension circular /

no.14; no.15 1927 Sep; no.21 1934 Mar; no.22 1934 Apr; no.23 1935 Feb; no.28 1939 Apr; no.29 1940 Feb; no.30 1940 Feb; no.34 1941 Apr; no.35 1941 Jul; no.36 1941 Aug; no.38 1941 Nov; no.42 1942 Mar; no.43 1942 Apr; no.45 1942 Apr; no.46 1942 May; no.48 1942 Jun; no.50 1942 Sep; no.52 1942 Dec; no.54 1943 Jan; no.55 1943 Feb; no.56 1943 Mar; no.57 1943 Apr; no.58 1943 May; no.59 1943 Apr; no.60 1943 Jun; no.64 1943 Jul; no.68 1943 Dec; no.71 1944 Mar; no.74 1944 Jun; no.75 1944 Apr; no.76 1944 Jun; no.79 1944 Jun; no.80 1944 Jun; no.82 1944 Jun; no.84 1944 Jun; no.77 1945 May; no.88 1945 Jan; no.89 1945 Jan; no.91 1945 Mar; no.93 1945 Apr; no.96 1945 Jun; no.81 1946 Sep; no.83 1946 Sep; no.97 1946 Feb; no.100 1946 May; no.101 1946 Jun; no.104 1946 Sep; no.105 1946 Dec; no.73 1947 Mar; no.107 (1947:Jan.); no.108 1947 Apr; no.109 1947 Jul; no.110 1947 Apr; no.111 1947 Apr; no.113 1947 Aug; no.114 1947 Sep; no.115 1947 Sep; no.116 1947 Oct; no.121 1948 May; no.123 1948 May; no.150 1950 Feb; no.166 1950 Nov