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21.
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Contribution to the knowledge of the nematodes that parasitize the reptiles of Mexico Caballero, R G
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22.
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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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23.
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Contributions to our knowledge of the duration of life in vertebrate animals Flower, Stanley Smyth
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24.
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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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25.
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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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26.
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Biogeography, current knowledge and conservation of threatened vascular plants characteristic of Mexican temperate forests Luna Vega, Mercedes Isolda - Ponce, A - Alcántara Ayala, Othon - Contreras Medina, Raúl
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27.
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Contributions to our knowledge of the duration of life in vertebrate animals Flarer, Stanley Smith
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28.
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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
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29.
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A contribution to a knowledge of the herpetology of a portion of the savanna region of central Petén, Guatemala Stuart, Laurence Cooper
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30.
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A contribution to the knowledge of variation in Opheodrys vernalis (Harlan), with the description of a new subspecies Grobman, Arnold B
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