| Publication Type: | Journal Article |
| Year of Publication: | 1952 |
| Authors: | S. Arias |
| Journal: | Memoria de la Sociedad de Ciencias Naturales La Salle |
| Volume: | 12 |
| Pagination: | 47-65 |
| Publication Type: | Journal Article |
| Year of Publication: | 1952 |
| Authors: | S. Arias |
| Journal: | Memoria de la Sociedad de Ciencias Naturales La Salle |
| Volume: | 12 |
| Pagination: | 47-65 |