| No aplica | (21) |
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| Revistas | (5) |
| 420 Inglés e inglés antiguo | (4) |
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| Facultad de Ciencias - UNAM | (20) |
| Revistas UNAM | (9) |
| Diálogos: educacionais em revista | (8) |
| Business: Theory and Practice | (6) |
| Universidad de los Andes Venezuela | (6) |
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11.
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MEXICAN VOLCANIC BELT: PRESENT STATE OF KNOWLEDGE AND UNSOLVED PROBLEMS, MEXICAN VOLCANIC BELT: PRESENT STATE OF KNOWLEDGE AND UNSOLVED PROBLEMS VERMA, S. P.; Departamento de Geotermia, Divisi6n de Fuentes de Energía, Instituto de investigaciones ‘Eléctricas, Apartado Postal 475, Cuernavaca, Mor. 62000, MEXICO.
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12.
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A contribtion to our knowledge of the herpetofauna of the Mexican state of Aguascalientes Anderson, James Donald - William Z Lidicker, Jr
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13.
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Contributions to the knowledge of the systematic arrangement and anatomy of certain genera and species of Squamata Beddard, Frank E
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14.
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A contribution to the knowledge of the l fauna of El Petén, Guatemala Stuart, Laurence Cooper
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15.
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Second addition to the knowledge of the Batrachia and Reptilia of Costa Pica Cope, Edward Drinker
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16.
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Third addition to a knowledge of the Batrachia and Reptilia of Costa Rica Cope, Edward Drinker
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17.
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Contributions to our knowledge of the duration of life in vertebrate animals Flower, Stanley S
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18.
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Some additions to the knowledge of the anatomy, principally of the vascular system, of Hatteria, Crocodilus and certain Lacertilia Beddard, Frank E
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19.
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Contribution to the knowledge of the nematodes that parasitize the reptiles of Mexico Caballero, R G
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20.
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A contribution to the knowledge of the variations of the tree frog Hyla regilla Test, Frederick Cleveland
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