Macroinvertebrate sampling techniques for streams in semi-arid regions : comparison of the Surber method and a unit-effort traveling kick method /

Bibliography: p. 20-21.

Beryllium sampling methods: Comparison of two personal sample collection methods with the AEC sample collection method as used for one year in a beryllium production facility. /

Item 499-F-2

Guidelines for air sampling and analytical method development and evaluation /

Mode of access: Internet.

The variate difference method,

Commission's seal on t.-p.