Appears to be a photograph of a photograph. Three Klippenstein sisters, Anna, Margaretha, and Helena married three Hamm brothers, Johann, Gerhard, and Bernhard. The women are wearing traditional headcoverings. The envelope is clearly meant for a different image. It says "Distant View looking N East from Sand Hill Various negatives."
Margaretha (Klippenstein) Hamm (seated) with 2 girls (standing). The girls could be Helena and Aganetha (Neta) Reimer; two orphaned sisters that the Hamms took in.