Siegfried Sack has written:
'Energiewirtschaftlicher Strukturwandel im Zeichen des Profits' -- subject(s): Economic policy, Power resources
Siegfried Lilienthal has written: 'Schinkel'
Siegfried Schelling has written: 'Spurennetz'
Siegfried Mrotzek has written: 'Kleinholz'
Siegfried Trautmann has written: 'Investitionen'
Siegfried Fink has written: 'Tabulatur 72 ='
Siegfried Sommer has written: 'Marile Kosemund'
Siegfried Zick has written: 'Poetic musings'
Siegfried Weinhold has written: 'Hallo, Gold!'
Siegfried. Klapper has written: 'Gouachen, Zeichnungen'
Siegfried Bader has written: 'NOTZINGER HEIMATBUCH'
Siegfried Otto has written: 'Tabellenbuch: Chemie'
Siegfried Weitz has written: 'Zum Beispiel Makarenko'