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| Facultad de Ciencias - UNAM | (20) |
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11.
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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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12.
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A contribution to the knowledge of the l fauna of El Petén, Guatemala Stuart, Laurence Cooper
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13.
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Second addition to the knowledge of the Batrachia and Reptilia of Costa Pica Cope, Edward Drinker
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14.
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Third addition to a knowledge of the Batrachia and Reptilia of Costa Rica Cope, Edward Drinker
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15.
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Contributions to our knowledge of the duration of life in vertebrate animals Flower, Stanley S
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16.
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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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17.
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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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18.
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Contributions to our knowledge of the duration of life in vertebrate animals Flower, Stanley Smyth
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19.
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Additions to the knowledge of the amphibians of the Estacion de Biologia Tropical "Los Tuxtlas" Pérez Higareda, Gonzalo
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20.
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A survey of internal oral features of leptodactyloid larvae (Amphibia: Anura) Wassersug, Richard J - W Ronald Heyer
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