Five wooden molecular model balls
circa 1810
circa 1810
1953
1967
1891
1888
1920-1924
1860-1869
1957-1959
1920-1925
1981
1981
1981
1981
1981
1981
1888
1920-1924
circa 1875
1981
1981
1981
1912-1914
1953
1920-1925
1920-1925
1920-1924
1958
1920-1925
1920-1925
1920-1924