Category:Dams completed in 1821
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192:Infrastructure completed in 1821
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163:Boston & Roxbury Mill Dam
182:Dams completed in the 1820s
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187:Dams by year of completion
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176:Categories
134:1870s
129:1860s
124:1850s
119:1840s
114:1830s
108:1820s
102:1810s
97:1800s
92:1790s
87:1780s
82:1770s
71:1826
66:1825
61:1824
56:1823
51:1822
46:1821
41:1820
36:1819
31:1818
26:1817
21:1816
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