Helmholtz
Helmholtz;
/ T.C. Mendenhall.
- Washington : Government Priting Officce, 1896.
- P.787-793 ; 25 cm.
- From The Smithsonian Report for 1895, Pages 787-793 . -
--Washington
FG 9 CX.10/62 (Biblioteca Pública Arquivo Regional de Ponta Delgada) - PDFG55166