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