^Private letter from Count Edward Piper to Ludvig Manderström, dated 19 November 1861 in Ludvig Manderströms collection, E 4753, Riksarkivet, Stockholm.
^Private letter from Count Edward Piper to Ludvig Manderström, dated 26 June 1864, Manderströms collections, E 4753. Riksarkivet, Stockholm.
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