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There is a page named "Category:Infrastructure completed in 1820" on Wikipedia
- Architecture portal Engineering portal 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1770s 1780s 1790s 1800s 1810s 1820s 1830s 1840s 1850s 1860s...3 members (1 subcategory, 0 files) - 23:23, 12 April 2020
- portal This category is for transport infrastructure completed in the year 1820. 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1770s 1780s 1790s...4 members (4 subcategories, 0 files) - 04:47, 13 April 2020
- Bridges completed in 1820. Transport portal Architecture portal This category is for bridges completed in the year 1820 1815 1816 1817 1818 1819 1820 1821...9 members (0 subcategories, 0 files) - 19:52, 23 May 2020
- in 1820. Transport portal Engineering portal This category is for lighthousess which were completed in the year 1820. 1815 1816 1817 1818 1819 1820 1821...7 members (0 subcategories, 0 files) - 23:11, 12 August 2020
- portal This category is for transport infrastructure completed in the year 1819. 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1760s 1770s 1780s...6 members (5 subcategories, 0 files) - 04:47, 13 April 2020
- Engineering portal This category is for canals which opened in the year 1820. 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1770s 1780s 1790s 1800s 1810s...4 members (0 subcategories, 0 files) - 11:10, 12 August 2020
- This category is for transport infrastructure completed in the year 1817. 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1760s 1770s 1780s 1790s...3 members (3 subcategories, 0 files) - 04:47, 13 April 2020
- portal This category is for transport infrastructure completed in the year 1818. 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1760s 1770s 1780s 1790s...4 members (4 subcategories, 0 files) - 04:47, 13 April 2020
- Engineering portal This category is for transport infrastructure completed in the year 1824. 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1770s...5 members (4 subcategories, 0 files) - 04:47, 13 April 2020
- Engineering portal This category is for transport infrastructure completed in the year 1823. 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1770s...6 members (4 subcategories, 0 files) - 04:47, 13 April 2020
- category is for transport infrastructure completed in the year 1815. 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1760s 1770s 1780s 1790s 1800s...5 members (4 subcategories, 0 files) - 04:47, 13 April 2020
- Engineering portal This category is for transport infrastructure completed in the year 1821. 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1770s 1780s...5 members (5 subcategories, 0 files) - 04:47, 13 April 2020
- This category is for transport infrastructure completed in the year 1816. 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1760s 1770s 1780s 1790s...5 members (5 subcategories, 0 files) - 04:47, 13 April 2020
- Engineering portal This category is for transport infrastructure completed in the year 1825. 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1770s...6 members (5 subcategories, 0 files) - 04:47, 13 April 2020
- Engineering portal This category is for transport infrastructure completed in the year 1822. 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1770s 1780s...6 members (4 subcategories, 0 files) - 04:47, 13 April 2020
- lines, rapid transit lines, monorails etc.) opened in the year 1820. 1813 1814 1815 1816 1819 1820 1821 1822 1823 1824 1825 1770s 1780s 1790s 1800s 1810s...2 members (0 subcategories, 0 files) - 04:36, 12 May 2020
- Architecture portal This category is for bridges completed in the decade 1820s, i.e. in the years 1820 to 1829 1770s 1780s 1790s 1800s 1810s 1820s 1830s...13 members (10 subcategories, 0 files) - 19:40, 23 May 2020
- media related to Bridges completed in 1816. Transport portal Architecture portal This category is for bridges completed in the year 1816 1811 1812 1813...6 members (0 subcategories, 0 files) - 19:52, 23 May 2020
- to Bridges completed in 1823. Transport portal Architecture portal This category is for bridges completed in the year 1823 1818 1819 1820 1821 1822 1823...5 members (0 subcategories, 0 files) - 19:52, 23 May 2020
- media related to Bridges completed in 1817. Transport portal Architecture portal This category is for bridges completed in the year 1817 1812 1813 1814...3 members (0 subcategories, 0 files) - 19:52, 23 May 2020