The calibration of photographic and spectroscopic films [microform] : the utilization of the digital image processor in the determination of aging of the surf clam (Spisula solidissima) : semi-annual report, May 1, 1987 - October 30, 1987 / by Kevin A. Peters and Ernest C. Hammond, Jr. ; submitted to NASA, Laboratory for Astronomy and Solar Physics, Goddard Space Flight Center

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