Ulmus 'Den Haag' (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ulmus 'Den Haag'" in English language version.

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biodiversitydata.nl

"Herbarium specimen - L.1587053". Botany catalogues. Naturalis Biodiversity Center. Sheet labelled U. pumila var. arborea × Ulmus × hollandica 'Belgica'; leaves specimen, Zuiderpark, The Hague (1962)
"Herbarium specimen - L.1587051". Botany catalogues. Naturalis Biodiversity Center. Sheet labelled U. pumila var. arborea × Ulmus × hollandica 'Belgica'; samarae specimen 1, Zuiderpark, The Hague; "Herbarium specimen - L.1587050". Botany catalogues. Naturalis Biodiversity Center. Sheet labelled U. pumila var. arborea × Ulmus × hollandica 'Belgica'; samarae specimen 2, Zuiderpark, The Hague

"List of plants in the {elm} collection". Brighton & Hove City Council. Retrieved 23 September 2016.

Santamour, Frank S.; Bentz, Susan E. (May 1995). "Updated Checklist of Elm (Ulmus) Cultivars for use in North America". Journal of Arboriculture. 21 (3): 122–131. Retrieved 20 June 2016.