 Angul Hammerich published his <em>J.P.E. Hartmann. Biografiske Essays tillige med en Studie over Melodien til ‘Kong Christian stod ved højen Mast’</em>, 
          which also contains an overview of Hartmann’s works. According to the foreword, the material was made available by Hartmann’s grandson, 
          the barrister Godfred Hartmann (1874–1956). Like its predecessors, this catalogue is divided into works with and without opus numbers. 
          The latter group is subdivided into seve