CORAf3-1 to -4, -8 to -10, -12 to -14, -16 to -18, -20 and -21: Photographer Foto-Bureau Wouter van Heusden (stamp)
CORAf3-5: Presumably Fotograaf Foto-Bureau Wouter van Heusden, same imprint as CORAf3-1 through -4
CORAf3-11: Presumably Photographer Photo-Bureau Wouter van Heusden, same imprint as CORAf3-8 through -10
CORAf3-15: Presumably Photographer Photo-Bureau Wouter van Heusden, same print as CORAf3-12 through -14
CORAf3-19: Presumably Photographer Photo-Bureau Wouter van Heusden same print as CORAf3-16 through -18