
Five wooden molecular model balls
circa 1810
circa 1810
1815-1825
1810-1830
1820-1830
2000-100 BCE
1815
1820
1825
1815
1955; 1830
1826
1813
1815
1825
1829
1812
1826
1810-1817
1863-7
1893-4
1775-1799 (original); 1900-1907 (model)
1815
1824
1821
1821
1823-1825
1829
1829
1829
1830
1826
1830 (original); 1967 (model)
4000-2001 BCE
circa 1810
1814
1990-96
1823-1825
1823
1824
1815-1825
1830
1705-1737
1811-1812
1829
circa 1821-1825
1821
1826
1826
1820
1821