1.
Cochabamba; s.n; Dic. 1987. 67 p. tab, graf.
Thesis
in Spanish
| LIBOCS, LILACS, LIBOE
| ID: biblio-1295194
2.
Cochabamba; s.n; Dic. 1987. 67 p. tab, graf.
Thesis
in Spanish
| LIBOCS, LILACS, LIBOSP
| ID: biblio-1314657
3.
Riobamba; s.n; s.f. 196 p. ilus, tab, graf.
Monography
in Spanish
| LILACS
| ID: lil-278030