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This photograph was taken in the late 1940s.

This photograph was taken on September 25, 1961.

This program was held on March 2, 1998.

This program was held on March 2, 1998.

This program was held on March 2, 1998.

This program was held on March 2, 1998.

This program was held on March 2, 1998.

Calculations, drawings, and charts created by Andy Hudak in relation to calendar reform.