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The U.S. military sprays clouds of zinc cadmium sulfide over multiple U.S. and Canadian cities.

Date: 1952

BIOW
MIL

The spraying is done in order to test the release mechanisms of biological weapons. The cities include Minneapolis, Minnesota; Winnipeg, Manitoba; St. Louis, Missouri; Fort Wayne, Indiana; the Monocacy River Valley in Maryland; and Leesburg, Virginia.