From Abstract: "This report is one of a sequence of quarterly reports, each designed to up-date its predecessor beginning with HASL-42, "Environmental Contamination from Weapon Tests." Herein are reported data which have accrued since HASL-51. 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."

This report applies the transient-flow simulation model to the Sacramento River in California; "the model has demonstrated that it can provide reliable daily mean as well as instantaneous discharge data," among other things. It includes a map, graphs, and tables.