Sketch of Heinrich Hertz
Sketch of Heinrich Hertz;
/ Helene Bonfort.
- Washington : Government Printing Office, 1896.
- P.719-726 ; 24 cm.
- From The Smithsonian Report for 1894, Pages 719-726 . -
--Washington
FG 9 CX.10/59 (Biblioteca Pública Arquivo Regional de Ponta Delgada) - PDFG55165