Siewert F. A windmill in a landscape, mixed media on paper 62,5 x 44,5 cm, signed l.r. and dated '86> more information
Siewert F. Country church, watercolour on paper 45,5 x 65,5 cm, signed l.l. and dated '75> more information
Siewert F. Harbour, watercolour on paper 45,5 x 65,5 cm, signed l.l. and dated 1975> more information