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This page is entirely in the public domain. All contributions to it are dedicated to the public domain with worldwide application. All contributors simultaneously grant any entity the perpetual right to use this work for any purpose, without any conditions. Please do not remove this notice.

XXI Texts is a project to find textbooks that have entered the public domain, such as those published in the United States prior to 1923, and revise them to be relevant to students in the twenty-first century. While works that old from some disciplines are nothing more that historical curiosities, in other disciplines where basic knowledge has not changed for some time older textbooks can be surprisingly relevant.

The XXI Texts team is currently working on its first volume, Alfred Marshall's Principles of Economics.