Here is the German original of what later became Human Action. It was published first in 1940 after Mises’s years in exile in Geneva.
Ludwig von Mises was the acknowledged leader of the Austrian school of economic thought, a prodigious originator in economic theory, and a prolific author. Mises’s writings and lectures encompassed economic theory, history, epistemology, government, and political philosophy. His contributions to economic theory include important clarifications on the quantity theory of money, the theory of the trade cycle, the integration of monetary theory with economic theory in general, and a demonstration that socialism must fail because it cannot solve the problem of economic calculation. Mises was the first scholar to recognize that economics is part of a larger science in human action, a science that he called praxeology.
The essay added later to the collection: a critique of proposals to nationalize banking and credit, weighing bureaucratic against profit management and warning of credit overexpansion and immobilization.
How German “anti-Marxism,” including national (anti-Marxian) socialism, absorbed the very Marxian ideas it claimed to oppose, with Werner Sombart as the case study of a thinker Marxist and anti-Marxist by turns.
Mises’s focused analysis of price controls: why fixing prices produces shortages and demands for still more controls, and what that reveals for the theory of social organization as a whole.
Editions Union Genf: 1940. Predecessor to Human Action.