The calibration of photographic and spectroscopic films [microform] : a densitometric analysis of IIa0 film flown aboard the space shuttle transportation system STS 3, STS 8, & STS 7 : semi-annual report, May 1, 1987 - October 30, 1987 / by Ernest C. Hammond, Jr. ; submitted to NASA, Laboratory for Astronomy and Solar Physics, Goddard Space Flight Center

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