A very special type of polysquare puzzles is the set of 'square-puzzles', where all given shapes are squares with integral sidelength.
Reference
... 11 - Sir Keith Holyoake, New Zealand Prime Minister (1960-1972) February 20 - Alexei Kosygin[?], Premier of the Soviet Union[?] (+ 1980) February 25 - Adelle Davis[?], ...