Willy Sluiter, 1916, print, NG-1979-159-C-27
Willy Sluiter (possibly), after Willy Sluiter, 1910 - 1949, print, RP-P-2019-4473
Willy Sluiter, 1920 - 1930, RP-R-1931-26
Willy Sluiter, 1916, print, NG-1979-159-C-42
Willy Sluiter, 1917, print, NG-1979-159-C-67
Willy Sluiter, 1917, print, NG-1979-159-C-73
Willy Sluiter, 1917, print, NG-1979-159-C-74
Willy Sluiter, 1916, print, NG-1979-159-C-50
Willy Sluiter, 1917, print, NG-1979-159-C-57
Willy Sluiter, 1917, print, NG-1979-159-C-68
