Includes bibliographical references.

Sherrill, N. D., and Dalrymple, G. B. A computerized multichannel data acquisition and control system for high-precision mass spectrometry.--Cannon, H. L., and Swanson, V. E. Contributions of major and minor elements to soils and vegetation by the coal-fired Four Corners Power Plant, San Juan County, New Mexico.--Bunker, C. M., Hedge, C. E., and Sainsbury, C. L. Radioelement concentrations and preliminary radiometric ages of rocks of the Kigluaik Mountains, Seward Peninsula, Alaska.--Hoffman, J. D., and others. Chemical variability of a metavolcanic rock unit in the Tracy Arm-Fords Terror Wilderness study area, Alaska, and the definition of background values for geochemical purposes.--Johnson, B. R., and others. Efficient stream-sediment sampling design.--McHugh, J. B., and Turner, J. H. Indirect determination of chloride in plants by atomic absorption spectrophotometry.--Haffty, J., Haubert, A.W., and Page, N. J. Determination of iridium and ruthenium in geological sample by fire assay and emission spectrography.--Klemic, H., and Loferski, P. J. Complesity of titaniferous magnetites from Essex County, New York, as a hindrance to beneficiation by a method based on Curie temperature differences.--Meier, A. L. Atechnique for the decomposition and dissolution of rocks and the determination of lithium, calcium, and magnesium using atomic-absorption spectroscipy.