Correction
JUL 01, 1978
DOI: 10.1063/1.3043357
December 1977, page 70—In the obituary of Manuel Sandoval Vallarta, the 13th and 14th lines of the second paragraph should read: “…the intensity of cosmic rays observed along ‘allowed directions’ is equal to that at infinity…”
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© 1978 American Institute of Physics
