[Heraldry, 1935] Heraldic problems (symbols), their origin, history and meaning, illustrated from a socio-historical point of view in connection with the heraldry of the Middle-Ages and later. Thesis for the acquisition of the degree of doctor of philosophy science of the British Western University […] Londen […] by Henri W.M.J. Nieuwenkamp, signing and calling himself Kits Nieuwenkamp, born at Groningen the 1st of March 1901. Haarlem 1935, 27 p.