Abstract This report is one of a sequence of quarterly reports, each designed to up-date its predecessor beginning with HASL~lj2, “Environmental Contamination from Weapon Tests". reported data which have accrued since HASL=-51. Herein are In particular, the levels of strontium 90 in fallout, milk, tap water, vegetation, and foods are given, based on data available from November 1, 1958 to January 30, 1959. ~iv-