Category:Cheltenham Magnetic Observatory. Maryland
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Media in category "Cheltenham Magnetic Observatory. Maryland"
The following 3 files are in this category, out of 3 total.
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Cheltenham Magnetic Observatory in Maryland - NOAA Photo Library.jpg 2,924 × 2,150; 2.72 MB
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PSM V69 D128 San francisco earthquake recorded by observatory in cheltenham md.png 2,822 × 1,147; 382 KB
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PSM V69 D129 San francisco earthquake recorded by observatory in cheltenham md.png 1,795 × 1,140; 44 KB