1.
Hugo Schuchardt an Matthias de Vries (01-1)
2.
Hugo Schuchardt an Matthias de Vries (04-3)
Matthias de Vries an Hugo Schuchardt (07-12555)
Matthias de Vries an Hugo Schuchardt (16-12561)
Dirk Christiaan Hesseling an Hugo Schuchardt (05-04682)
Rodolfo Lenz an Hugo Schuchardt (04-06398)
Carl Gotthilf Büttner an Hugo Schuchardt (01-01463)
Hugo Schuchardt an Vatroslav Ignaz Jagič (23-s-n)
Emil Metzger an Hugo Schuchardt (01-07122)
Emil Metzger an Hugo Schuchardt (02-07123)