New York Times Obituary of Hamilton Twombly

List of Vanderbilt Family Homes including Florham

Suffolk County Vanderbilt Museum
    also showing a list of Vanderbilt family homes

Vanderbilt Family Geneology Page
   with a striking photo of the Florham mansion before trees surrounded the Clowney Gardens

History of the Exxon Campus
   at one time the model farm area of the Florham estate

Vanderbilt Family Geneology
   with a long paragraph on the Vanderbilt-Twombly couple and the estate

Biography of Ruth Vanderbilt Twombly
  with portrait in oil

Florence Adele Vanderbilt Twombly
   with a number of period photographs of the Florham estate

Maggie Land Blanck's Postcard Collection
  including shots of contemporary buildings in the Madison area and one early postcard of the estate.

The Twomblys of Florham
  video with Walter Savage, Carol Bere and Arthur Vanderbilt II, recorded March 29, 2009