Collectivist Economic Planning
The argument that socialism was impossible as an economic system - set off two decades of debate, so by the time the essays appeared in English, in this very book here, in 1935, the debate was still raging. This volume edited by F.A. Hayek dug the knife into socialism's heart unlike any book to ever appear. It contains essays by Mises along with a foreword and afterword by Hayek. It also contains more commentary by N.G. Pierson, George Halm, and Enrico Barone.
It is exceptionally well edited and beautifully argued, and has not been in print for many years. The contents are nothing short of prophetic.