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Recurso libre 
1.
Additions to the knowledge of the amphibians of the Estacion de Biologia Tropical "Los Tuxtlas"
Pérez Higareda, Gonzalo
Formato:
Enlaces:
Fecha: 2012-09-14
Recurso: Facultad de Ciencias - UNAM

Recurso libre 
2.
A contribution to the knowledge of the l fauna of El Petén, Guatemala
Stuart, Laurence Cooper
Formato:
Enlaces:
Fecha: 2012-09-13
Recurso: Facultad de Ciencias - UNAM

Recurso libre 
3.
Third addition to a knowledge of the Batrachia and Reptilia of Costa Rica
Cope, Edward Drinker
Formato:
Enlaces:
Fecha: 2012-09-13
Recurso: Facultad de Ciencias - UNAM

Recurso libre 
4.
Some additions to the knowledge of the anatomy, principally of the vascular system, of Hatteria, Crocodilus and certain Lacertilia
Beddard, Frank E
Formato:
Enlaces:
Fecha: 2012-09-13
Recurso: Facultad de Ciencias - UNAM

Recurso libre 
5.
A contribution to a knowledge of the herpetology of a portion of the savanna region of central Petén, Guatemala
Stuart, Laurence Cooper
Formato:
Enlaces:
Fecha: 2012-09-13
Recurso: Facultad de Ciencias - UNAM

Recurso libre 
6.
Main factors that determine students´ level of proficiency in English Intermediate I of the Foreign Languages Department of the University of El Salvador during the semester II-2011.
Pérez González, Claudia Patricia - Orellana Villeda, Ingrid Mariela - Figueroa Urbano, Vicky Evangelina - Ortiz Rivera, Ana Blanca Guadalupe
Formato: Thesis, NonPeerReviewed
Enlaces:
Fecha: 2012-07
Recurso: Institucional de la Universidad de El Salvador

Recurso libre 
7.
Different factors influencing students’ in-class oral active participation, considering english domain in students of Intermediate English I, at the Foreign Languages Department.
Rivera Marroquin, Francisco - Cuellar Melara, Josue Gustavo - Miranda Diaz, Joaquin Alexander - Chavez Aquino, Gerson Efrain
Formato: Thesis, NonPeerReviewed
Enlaces:
Fecha: 2012-07
Recurso: Institucional de la Universidad de El Salvador

Recurso libre 
8.
Editorial Policy
*, *; Research and Publication Office - Liceo de Cagayan University
Formato:
Enlaces:
Fecha: 2012-07-24
Recurso: Asian Journal of Biodiversity

Recurso libre 
9.
Editorial Policy
*, *; Research and Publication Office - Liceo de Cagayan University
Formato:
Enlaces:
Fecha: 2012-07-24
Recurso: Asian Journal of Biodiversity

Recurso libre 
10.
Editorial Policy
*, * *; Research and Publication Office - Liceo de Cagayan University
Formato:
Enlaces:
Fecha: 2012-07-24
Recurso: Asian Journal of Biodiversity