books

Books about Groothoff:

booksDie Kirchenbauten Hugo Groothoffs (1851-1918) by Sidney Sheldon (2004)

booksDie Kirchenbauten Hugo Groothoffs (1851-1918) by Sabine Behrens (2006)

wiki

Wiki information Groothoff:

Jakob Groothoff
Musician, Person

Louise Groothoff
Person