Houten-Groeneveld.jpg https://astronomische-gesellschaft.de/en/member/obituaries/houten-groeneveld.jpg/view https://astronomische-gesellschaft.de/en/member/obituaries/houten-groeneveld.jpg/@@download/image/Houten-Groeneveld.jpg Houten-Groeneveld.jpg Click to view full-size image… Size: 35.0 KB