December 1, 1848
The first volume of Smithsonian Contributions to Knowledge is published. Ancient Monuments of the Mississippi Valley, comprising the results of Extensive Original Surveys and Explorations, by E. G. Squier and E. H. Davis, is illustrated by forty-eight lithographic plates and 207 wood engravings. Smithsonian Secretary Joseph Henry decides against copyrighting this or any Smithsonian publications. The first volume of Contributions will be distributed to learned societies in approximately twenty-five foreign countries.