Five wooden molecular model balls
circa 1810
circa 1810
circa 1856
1825
1875-1885
1861
1855-1865
1845-1855
1895-1900
1830
1870-1900
1860
1890-1895
1835
1865-1875
circa 1830
1855-1865
1905-1915
1850-1860
1910-1920
1845-1855
1880-1900
1855-1865
1855-1860
1880-1900
1910-1915
1895-1905
circa 1820
1900
1835-1845
1870-1880
1910-1950
1912
1905-1915
circa 1835
1895-1905
1892-1895
1844
1845
circa 1820
1900
circa 1820