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The series of manuals on techniques describes procedures for planning and executing specialized work in water-resources investigations. The material is grouped under major subject headings called "books" and further subdivided into sections and chapters. Section A of Book 3 is on surface water. The unit of publication, the chapter, is limited to a narrow field of subject matter. This format permits flexibility in revision and publication as the need arises. Chapter Al8 deals with the application of dye and gas tracers for the measurement of stream reaeration coefficients. Provisional drafts of chapters are distributed to field offices of the U.S.

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