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