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.

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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 most popular method of deprecating capitalism is to make it responsible for every condition which is considered unsatisfactory.
If one does not stop in time the pernicious policy of increasing the quantity of money and fiduciary media, the nation's currency system collapses entirely.
"Politically there is nothing more advantageous for a government than an attack on property rights, for it is always an easy matter to incite the masses against the owners of land and capital."
Editions Union Genf: 1940. Predecessor to Human Action.