University of Iowa studies ...

no.3 1917; no.5 1918; no.6 1919; no.8 1920; no.9 1920; no.10 1920; no.11 1921; no.12 1922; no.13 1924; no.14 1924; no.16 1925; no.17 1926; no.18 1926; no.20 1926; no.22 1927; no.25 1928; no.26 1929; no.28 1930; no.32 1930; no.33 1931; no.34 1931; no.35 1931; no.36 1931; no.37 1932; no.38 1932; no.40 1933; no.43 1933; no.44 1934; no.45 1934; no.47 1935 incompl.; no.47 1935; no.48 1935; no.49 1936; no.50 1936; no.53 1935-1937; no.51 1937; no.52 1937; no.54 1937; no.57 1938; no.60 1939; no.61 1939; no.63 1939; no.62 1939-1940; no.64 1940; no.66 1940; no.66a 1940; no.68 1941; no.69 1941; no.71 1942; no.72 1943; no.73 1943; no.74 1943; no.75 1944; no.76 1944; no.77 1944; no.79 1945; no.80 1945; no.81 1953 pt.1; no.81 1953 pt.2; no.82 1954; no.83 1954