Category:1820 in the environment
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202:This category has only the following subcategory.
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49:human impact on the environment
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32:These articles relate to the
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249:1820s in the environment
65:environmental issues
244:Environment by year
57:nature conservation
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238:Categories
223:(3 C, 4 P)
40:the year
188:1870s
183:1860s
178:1850s
173:1840s
168:1830s
162:1820s
156:1810s
151:1800s
146:1790s
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136:1770s
254:1820
125:1825
120:1824
115:1823
110:1822
105:1821
100:1820
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90:1818
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75:1815
63:and
42:1820
38:in
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