The publication of Mildred's literary endeavors began in the 1920s with her participation as editor and contributor to the Wisconsin Literary Magazine. Mildred's passion and devotion to literature continued in Germany in the 1930s and early 1940s through her translations of books and poems (e.g. Goethe) into German and English, as well as her teaching - introducing her students to the likes of Thorton Wilder, Thomas Wolfe and William Faulkner.
 
The following images represent examples of Mildred's translation of books from English into German.

In the United States, Arvid Harnack had studied political economics, specifically organizational and economic policy. After returning to Germany, he wrote his second dissertation which dealt with the history of the American workers movement, out of which came the written work entitled Die vormarxistische Arbeiterbewegung in den Vereinigten Staaten; Eine Darstellung ihrer Geschichte. This was to be the "ersten Teil" or first part of the history of the American worker's movement which, Arvid states in the preface, "...basiert in der Hauptsache auf dem Urkundenmaterial, das sich in der Staatsbibliothek von Wisconsin und in der Bibliothek des Kongresses in Washington befindet." (Roughly translated, Arvid states that his writing is based mainly on the documents that were found in the State Historical Society Library in Wisconsin and the Library of Congress.) It is not clear if Arvid Harnack ever had the chance continue the history before he was executed in 1942.