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VISITORS TO MOUNT WILSON & PALOMAR OBSERVATORIES [1]
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"The Mount Wilson and Palomar Observatories and Solar System Studies,"
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PLANS FOR JOINT OPERATION OF MOUNT WILSON AND PALOMAR OBSERVATORIES [20]
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[Incl 3 ltrs PAScherer to ISB; ltr LAD to ISB; ltr JFSullivan to ISB; c.ltr LAD to V.Bush. 1 folded.]
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