. . "Ingénieurs électriciens Correspondance." . . . . . . . . . "A collection of letters to Sir Charles William Siemens, 1823-1883"@en . "A collection of letters to Sir Charles William Siemens, 1823-1883" . . . . "A collection of letters to Sir Charles William Siemens, 1823-1883 : with a short biography" . . "Records and correspondence"@en . . . . . . "A collection of letters to Sir Charles William Siemens 1823-1883"@en . "A collection of letters to Sir Charles William Siemens 1823-1883" . . . . . "A collection of letters to Sir Charles William Siemens : 1823-1883" . . . . . . .