Letter from Louise Haas to her son Otto Haas (1872-1960).

Letter from Louise Haas to her son Otto Haas (1872-1960).

Otto Haas was the co-founder of Rohm & Haas, best known for manufacturing Plexiglas (acrylic glass), as well as foundational chemical ingredients used in latex…

Letter from Fritz von Gemmingen-Hornberg (1860-1924) to Otto Haas (1872-1960), about business progress despite the challenges regarding the "Röhm patent".

A booklet of letters written by Phoebe Waterman Haas (1882-1967) to her family, dated from August 22, 1923, through October 14, 1923. Waterman Haas traveled to London, Berlin, and Stuttgart. Along with her letters are…

Letter from Otto Rohm (1876-1939) to his friend and business partner, Otto Haas (1872-1960). In this letter, Rohm asks if Haas would be able to meet his fiancée and urges him to find a wife of his own.

The letter is…

Art created by Hilla Lörcher, sent to Phoebe Waterman Haas (1882-1967). Lorcher leaves a note on the back of the art reading "for September 20th my wish: the Autumn of your life may be as gay and coloured as the forest…

Drawings from letters sent by Hilla Lörcher to Phoebe Waterman Haas (1882-1967).

Collage made of pressed flowers on cream colored paper, created by Hilla Lörcher and sent to Phoebe Waterman Haas (1882-1967).

Handmade passport created by Hilla Lörcher for Phoebe Waterman Haas (1882-1967). Inside the passport is a letter to Phoebe from Hilla, describing her favorite places she has traveled in Italy. The letter ends with a…

Postcard from Hilla Lörcher to Phoebe Waterman Haas (1882-1967). The postcard features an image of the Rathaus (Town Hall) in Stuttgart, Germany, following its destruction in 1945 during World War II.

Letter from Hilla Lörcher to Phoebe Waterman Haas (1882-1967). The letter mentions sending pressed flowers enclosed in a card, a visit to archaeological excavations under a church in Esslingen, Germany, and sentiments…