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AN ELEMENTARY THEORY FOR THE FORMATION OF ARMS IN SPIRAL GALAXIES Su-Shu Huang and Paris Pishmish PDF (2.7 Mb)	7
VARIABLES ERUPTIVAS EN EL HALO GALÁCTICO Guillermo Haro and Enrique Chavira PDF (4.75 Mb)	11
FOUR STARS OF LARGE PROPER MOTION IN THE ORION REGION Guillermo Haro and Willem J. Luyten PDF (810 Kb)	16
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WOLF-RAYET STARS IN THE VICINITY OF THE ASSOCIATION VI CYGNI George H. Herbig and Eugenio E. Mendoza V. PDF (2.35 Mb)	21