Hong Kong Observatory 1970-01-01
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Kandilli Observatory 1970-01-01
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Mineralogical Society of America 1970-01-01
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Nicholas Bingham 1970-01-01
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Octav Onicescu 1970-01-01
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Optical path length 1970-01-01
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Optical sine theorem 1970-01-01
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Optical space 1970-01-01
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Paraxial approximation 1970-01-01
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Pencil (optics) 1970-01-01
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Scheimpflug principle 1970-01-01
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Shooting and bouncing rays 1970-01-01
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Signal reflection 1970-01-01
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Smith–Helmholtz invariant 1970-01-01
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Distortion (optics) 1970-01-01
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Eikonal equation 1970-01-01
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Eskdalemuir Observatory 1970-01-01
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Geophysical Institute 1970-01-01
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German Geophysical Society 1970-01-01
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Gibilmanna Observatory 1970-01-01
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