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Det statistiske Centralbureau
The National Archives of Norway
Swedish National Heritage Board
Naturalis Biodiversity Center
Naturalis Biodiversity Center
Det statistiske Centralbureau
The National Archives of Norway
Glomdal Museum
Zuiden, Fotopersbureau Het
City Archives' s-Hertogenbosch
Royal Botanic Gardens Kew
The Trustees of the Natural History Museum, London
Meise Botanic Garden
National and University Library of Slovenia
The Trustees of the Natural History Museum, London
Naturalis Biodiversity Center
Deutsche Fotothek
Lansink, V.M., fotograaf
The Utrecht Archives
Meise Botanic Garden
The Trustees of the Natural History Museum, London
Naturalis Biodiversity Center
Virtual Library of Historical Press
Naturalis Biodiversity Center
Natural History Museum, Vienna
National and University Library of Slovenia