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