Grietje Slier was a daughter of Philip Slier and Betje Benjamins. A picture of her and a postcard from Westerbork (5 December 1942) are published in D. Slier and I. Shine, Hidden letters, a glimpse of Holland during World War II (New York 2007) 115, 119
A family photo is published in D. Slier and I. Shine, Hidden letters, a glimpse of Holland during World War II (New York 2007) 104.
In addition, a Jokos file (number 14932) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappe…