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Lego Foundation: The Role of Play in Children's Development
This article reviews research that has been conducted in relation to the five types of play, namely physical play, play with objects, symbolic/semiotic play, pretend play, and games with rules.
TheatreHistory.com
Theatre History: American Musical Theatre: An Introduction
A commercial website that provides a solid history of American musical theatre. Includes summaries of many musicals through history. Focus is on shows before 1960.