Items

• [X031A], Report from Exhibition. Philadelphia Centennial (1876), Joseph Henry, William Thomson (Lord Kelvin), June 20th, 1876
  1876-06-20
• [X031B], Report from Exhibition. Philadelphia Centennial (1876), June 30th, 1876
  1876-06-30
• [X031C], Report from Exhibition. Philadelphia Centennial (1876), Joseph Henry, William Thomson (Lord Kelvin), July 8th, 1876
  1876-07-08
• [X031D], Report from Exhibition. Philadelphia Centennial (1876), Joseph Henry, August 1st, 1876
  1876-08-01
• [X031E], Bill/Receipt from Exhibition. Philadelphia Centennial (1876) to Thomas Alva Edison, August 31st, 1877
  1877-08-31