Photographs of structures and land owned by Kenneth Spencer, both under construction and completed, particularly for the businesses he owned. Images include details of a power plant, gas reforming plant, ammonia synthesis plant, nitric acid structure, ammonium nitrate building, etc. There are also several photographs removed from the manuscript collection, including formal portraits of KAS; posed photographs of KAS, often with other individuals with whom Spencer worked or had dealings with; and personal photographs of both Kenneth and Helen Spencer, as well as photographs from Spencer's childhood and youth.