| PAGES | ARTICLES |
| 207-232 | Quantum Theory of the Magnon-Phonon Interaction in a Time-Dependent Magnetic Field
S. C. Guerreiro, S. M. Rezende |
| 233-244 | A New Approach Toward Dual Models*
Y. Hama, E. Predazzi |
| 245-254 | Comportamento do Centro F sob Tensão
R. Casanova Alig |
| 255-262 | Measurements of Perturbed Angular Correlations in Compounds of 57CO
A. Vasquez, P. da R. Andrade, J. D. Rogers |
| 263-288 | Variation du Flux des Neutrons Rapides et des Rayons Gamma d'origine Cosmique en Fonction de la Latitude et de l'Altitude
Inacio Malmonge Martin, F. Albernhe, G. Vedrenne |
| 289-296 | On the Activity of Solar Coronal Condensations Discussed ifter Long-Enduring Microwave Events
Pierre Kaufmann |
| 297-302 | The Solar Radio Burst Activity Index (I,) and the Burst Incidence (Bi) for 1968-69
D. Basu |
| 303-312 | Analyticity and Dual Absorptive Models
H. Fleming |
| 313-324 | Formação Pedagógica de Professores de Física antes do Exercício da Profissão
Fletcher G. Watson |
| 325-336 | Campo Magnético e Distância
Fernando Sodré |