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| holtzapffel & co1872
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| “our galaxy an example of the spiral nebula type” natural history 1963 |
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| nature's invisible forces 1917
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| cornu’s spiral1901 |
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| finger prints simplified 1920 |
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| the serpent symbol and the worship of the reciprocal principles of nature 1851 |
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| Vorticity 1961 |
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| Ha Bun Shu 1919
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