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The Discovery of the First Gravitational Lenses
Astronomy Beat #33 The Discovery of the First Gravitational Lenses (PDF, 1.3 MB)by Ray Weymann (Staff Member Emeritus, Carnegie Observatories) Click on the link above to view the pdf, or right-click (PC)/control-click (Mac) the link to download the file to your computer. Adobe Reader is required to view Astronomy Beat. [Read More…]