12281
Published in 1971
Repository
12282
12283
12284
by Alwang, Jeffrey; Weller, Stephen C.; Sánchez, Guillermo E.; Calderón, Luis; Edwards, C. Richard; Hamilton, Sarah; Williams, Roger; Ellis, Mike; Suárez, Carmen; Barrera, Víctor Hugo; Crissman, Charles; Norton, George W.
Published in 2005
Repository
12285
12286
12287
12288
12289
12290
by Villares, Mercy; Martínez, Aníbal; Viteri D., Pablo; Viera, William; Jácome, Rosendo; Ayala, Germán; Noboa, Michelle
Published in 2016
Repository
12291
12293
12294
12295
12296
Published in 1982
Repository
12297
Published in 1989
Repository
12298
Published in 1991
Repository
12299
Published in 1974
Repository
12300