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Brockhaus-1809: D. William Robertson
Brockhaus-1911: Redan · Robertson [2] · Robertson
Herder-1854: Redan · Robertson
Lueger-1904: Inneres Produkt · Inneres Arbeitsvermögen
Meyers-1905: Redan · Robertson [2] · Robertson [1] · Inneres Licht
Pagel-1901: Robertson, Sir Will. Tindal · Robertson, Charles