颗粒度:因国家而异。在极地用弹簧测量重力,然后在厄瓜多尔。1925年的匿名插图。私人收藏。(Grainness: it varies with countries. Measuring gravity with a spring at the pole and then in Ecuador. Anonymous illustration from 1925. Private collection.)匿名匿名 |
€ 96.73
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日期不详 · Engraving
· 图片ID: 915751
Private Collection / Bridgeman Images |
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