boletÍn de los observatorios de tonantzintla ......those estimates d n.ived from plates obtained...
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BOLETÍN DE LOS OBSERVATORIOS DE TONANTZINTLA Y TACUBAYA, VOL. 2, N°13, 1955.©
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5: In
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© C
opyr
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5: In
stitu
to d
e A
stro
nom
ía, U
nive
rsid
ad N
acio
nal A
utón
oma
de M
éxic
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