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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.
Contribution to the knowledge of the nematodes that parasitize the reptiles of Mexico
Caballero, R G
Formato:
Enlaces:
Fecha: 2012-09-13
Recurso: Facultad de Ciencias - UNAM

Recurso libre 
3.
Addresses in memory of Edward Drinker, Cope delivered at the meeting in the hall of the American Fhilosophical Society held at Philadelphiafor promotig useful knowledge
Anonymous
Formato:
Enlaces:
Fecha: 2012-09-13
Recurso: Facultad de Ciencias - UNAM

Recurso libre 
4.
A contribtion to our knowledge of the herpetofauna of the Mexican state of Aguascalientes
Anderson, James Donald - William Z Lidicker, Jr
Formato:
Enlaces:
Fecha: 2012-09-13
Recurso: Facultad de Ciencias - UNAM

Recurso libre 
5.
The concise knowledge library: natural history
Lydekker, Richard
Formato:
Enlaces:
Fecha: 2013-08-08
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