July 1971, page 15—Reference 1 should have been toPhys. Rev. Lett.24, 1188 (1970). June 1971, page 69—Our item on the appointment of J. Reginald Richardson as director of the TRIUMF project at Vancouver, Canada failed to make clear the fact that he will be on a two‐year leave of absence from the University of California at Los Angeles. June 1971, page 58—NCRP Report No. 39: Basic Radiation Protection Criteria is $2.00 a copy, not $20.00 as stated.