SPA Certification

Cultural-Political

1760 - 1830
1776 - 1783
1861 - 1865
1914 - 1918
1929 - 1943
1939 - 1946

Breakthrough Inventions (partial list)

1687
1870 - 1879
1928 - 1942

Agencies and Funding (partial list)

1887
1900
1900
1900
1900
1900
1900
1900
1900
1900
1900
1900
1900
1900
1900
1900
1900

Regulations (partial list)

1862