Vol. 13 No. 50 (1968)

Published November 20, 2025
Full Issue
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Physical Sciences

LUIS GUILLERMO DURAN S, ALFONSO LOPEZ REINA
279-283
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Natural Sciences

FEDERICO MEDEM
149-199
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JOSE CUATRECASAS
201-226
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GABRIEL DE J. ACEVEDO
237-257
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ALBERTO MORALES ALARCON
267-272
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HERMANDO GARCIA BARRIGA
273-277
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REINHARD KAUFMANN, ENRIQUE PEREZ ARBELAEZ
293
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Earth Sciences

JESUS EMILIO RAMIREZ
228-235
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MANUEL DEL LLANO
263-265
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ALFREDO D. BATEMAN
285-289
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Mathematics

FRANCISCO LLERAS
259-261
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In Memoriam

MANUEL DEL LLANO
291
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