De zusjes Jonker | Op de hei
Lucas Jonker was the director of the Amsterdam coffee milling company Jonker & Co. With his wife he had five daughters and two sons. Daughter Corrie was the photographer; she signed ‘Corrie H. Jonker phot.’ She took group photographs of the family in Rustenhove
House in Maartensdijk, and made little landscape photographs on the heath and near Hattem.