At first he had great difficulties hearing the phonetic distinctions of the language, but in 1931 he went to the field with Danish linguist Hans Jørgen Uldall who taught him to recognize all the phonetic contrasts.
In 1931-32 he went to the California to do field work on the Maidu language under the auspices of the Archaeological and Ethnographic Survey of California, established by A. L. Kroeber in 1901.
(Four previously unpublished traditional narratives collected from Phoebe Maddux and Fritz Hansen by John P. Harrington in 1926 and from Margaret Harrie by Hans Jørgen Uldall in 1932.)
Hans Christian Andersen | Hans Holbein the Younger | Hans Zimmer | Hans Werner Henze | Hans Memling | Hans Pfitzner | Hans Küng | Hans Conried | Hans Knappertsbusch | Hans Magnus Enzensberger | Hans-Dietrich Genscher | Hans Blix | Hans Zender | Hans Scholl | Hans Hofmann | Hans Christian Ørsted | Hans Raj Hans | Hans Habe | Hans Baldung | Baron Hans Heinrich Thyssen-Bornemisza | Hans von Ohain | Hans van Manen | Hans Urs von Balthasar | Hans Sloane | Hans Rosbaud | Hans-Georg Backhaus | Hans-Adam II, Prince of Liechtenstein | Yuvraj Hans | Jørgen Leth | Hans von Halban |