April 1973

Sunday 01:

Project Tiger, a tiger conservation project, is launched in the Corbett National Park, India.

Monday 02:

Vietnam War: Thousands of civilian refugees flee from the Quang Ngai Province in front of advancing North Vietnamese troops.

Wednesday 04:

The World Trade Center in New York is officially dedicated.

Thursday 05:

Pierre Messmer becomes Prime Minister of France

Friday 06:

Launch of Pioneer 11 spacecraft.

Monday 30:

Watergate Scandal: President Richard Nixon announces that top White House aids H.R. Haldeman, John Ehrlichman, and others have resigned.