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Est. Mar 17, 1950, when it assumed some functions from Dept. of Supply and Development; Dept. of Prime Minister's; and Dept. of Works and Housing. Abolished Dec. 19, 1972. Re-est. Dec. 20, 1977, when it assumed some functions from Dept. of National Resources; and Dept. of Environment, Housing and Community Development. Succeeded Dec. 8, 1979, by Dept. of National Development and Energy. Works by these bodies are entered under the name used at the time of publication