Items

• [CJ601AAB], Letter from Lehigh Portland Cement Co, Charles Arthur Matcham to Francis Robbins Upton, January 20th, 1899
  1899-01-20
• [CJ613ABL], Letter from Lehigh Portland Cement Co, Charles Arthur Matcham to West Orange Laboratory, May 19th, 1905
  1905-05-19
• [CJ623AAE], Agreement, Alpha Portland Cement Co, Atlas Portland Cement Co, North American Portland Cement Co, Lehigh Portland Cement Co, December 30th, 1907
  1907-12-30
• [D9820AAV], Letter from Lehigh Portland Cement Co, Charles Arthur Matcham to Thomas Alva Edison, December 17th, 1898
  1898-12-17
• [QQ001AAL], Letter from Lehigh Portland Cement Co, Charles Arthur Matcham to Thomas Alva Edison, April 28th, 1904
  1904-04-28