The Caduceus :

v.2:1-2 (1923); v.5:2-3 (1926); v.5 no.1 1926; v.5 no.2 1926; v.6 no.1 1927; v.6 no.2 1927; v.6 no.3 1927; v.6-7 (1927-28); v.7 no.1 1928; v.7 no.2 1928; v.8 no.1 1929; v.8 no.2 1929; v.8 no.3 1929; v.8 no.4 1929; v.8-9 1929-30; v.9 no.1 1930; v.9 no.2 1930; v.9 no.3 1930; v.9 no.4 1930; v.10 no.1 1931; v.10 no.2 1931; v.10 no.3 1931; v.10 no.4 1931; v.10-11 1931-32; v.11 no.1 1932; v.11 no.2 1932; v.11 no.3 1932; v.11 no.4 1932; v.10-12 (1931-33); v.12 no.1 1933; v.12 no.2 1933; v.12 no.3 1933; v.12 no.4 1933; v.12-13 1933-34; v.13 no.1 1934; v.13 no.2 1934; v.13 no.3 1934; v.13 no.4 1934; v.13-14 (1934-35); v.14 no.1 1935; v.14 no.3 1935; v.14 no.4 1935; v.14-15 1935-36; v.15 no.1 1936; v.15 no.2 1936; v.15 no.3 1936; v.15 no.4 1936; v.15-16 (1936-37); v.16 no.1 1937; v.16 no.2 1937; v.16 no.4 1937; v.17 no.1 1938; v.17 no.2 1938; v.17 no.3 1938; v.17 no.4 1938; v.17-18 (1938-39); v.18 no.1 1939; v.18 no.3 1939; v.18 no.4 1939; v.19 (1940); v.19 no.1 1940; v.19 no.2 1940; v.19 no.3 1940; v.19 no.4 1940; v.20 (1941); v.20 no.1 1941; v.20 no.2 1941; v.20 no.3 1941