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Photometric Precision and Accuracy.- The High Road to Astronomical Photometric Precision: Differential Photometry.- High Precision Differential Photometry with CCDs: A Brief History.- The Pierce-Blitzstein Photometer.- Johnson Photometry and its Descendants.- The Rise and Improvement of Infrared Photometry.- On the Use of Photometry in Spectral Classification.-

Absolute Photometry: Past and Present.- Optical Region Spectrophotometry: Past and Present.- Measurement of Polarized Light in Astronomy.- Index.- References.