Report on the ventilation of the Hall of Representatives, and of the south wing of the Capitol of the United States: to Prof. Jos. Henry, Col. T. Lincoln Casey, Dr. J. S. Billings, Edw. Clark, Esq., F. Schumann, Esq., commission of inquiry, etc

Report on the ventilation of the Hall of Representatives, and of the south wing of the Capitol of the United States: to Prof. Jos. Henry, Col. T. Lincoln Casey, Dr. J. S. Billings, Edw. Clark, Esq., F. Schumann, Esq., commission of inquiry, etc