Bradley Family Foundation (2012). "Vegetative Sculpture I (sculpture)". Inventory of American Sculpture. Smithsonian Institution. Archived from the original on 4 March 2016. Retrieved 27 December 2012.
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Bradley Family Foundation (2012). "Vegetative Sculpture I (sculpture)". Inventory of American Sculpture. Smithsonian Institution. Archived from the original on 4 March 2016. Retrieved 27 December 2012.