The World's Industrial and Cotton Centennial Exposition, New Orleans, La., 1884–'85. No. 6, Description of the microscopes and microscopical preparations, from the Army Medical Museum, Washington, D.C

The World's Industrial and Cotton Centennial Exposition, New Orleans, La., 1884–'85. No. 6, Description of the microscopes and microscopical preparations, from the Army Medical Museum, Washington, D.C