This collection contains newspaper clippings, including those about Robert Seyfarth's death, his son Robert Jr. and his wife, Mary Hays Seyfarth, as well as the Brewster Shirt Factory.

Additionally, the collection contains documents and correspondence to Mary K. Seyfarth (Robert Sr's granddaughter), regarding her grandfather and her career as an artist.

The collection also features family photographs and brochures for Robert Seyfarth home tours.

A substantial portion of the Weber & Weber Collection contains documents relating to the Ravinia Festival Park as Bertram Weber worked on a number of architectural projects at the park. These documents include correspondence and architectural proposals and plans for work on the Pavilion, West Parking Lot, Murray Theater, Gate Building, First Aid Building, and West Toilet Building, among others. Related to Ravinia, there are also financial documents, annual reports, festival publications, art exhibit documents, festival flag designs, as well as Board of Trustee and Executive Committee meeting minutes.

Also in the collection are personal documents of Bertram Weber. This includes correspondence between he and clients and family and friends, as well as documents related to the various clubs and associations to which Weber belonged. The collection also contains architectural tools used by both Bertram and John Weber.

The collection contains a number of building plans and blueprints from projects designed by Weber. These projects include both private residences and public buildings, such as churches, schools and retirement homes. Highlighting two major projects on which Weber worked, there are two series devoted to the Aurora and Exmoor Country Clubs. They contain documentation ranging from designs and contracts to a drawing log, cost estimates and test reports.