Columbia subject headings:
Harden, Maximilian, 1861-1927--Correspondence.
Mann family.
Pringsheim-Dohm, Hedwig, 1855-1942--Correspondence.
Harvard subject headings:
Harden, Maximilian, 1861-1927--Correspondence.
Mann family.
Pringsheim-Dohm, Hedwig, 1855-1942--Correspondence.
Princeton subject headings:
Harden, Maximilian, 1861-1927.
Pringsheim-Dohm, Hedwig, 1855-1942--Correspondence.