Roy F. Weston, Inc. : protecting the quality of our environment
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Roy F. Weston, Inc. : protecting the quality of our environment
（Newcomen publication, no. 1231）
Newcomen Society of the United States, 1987
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注記
"Address ... delivered at a '1984 Pennsylvania meeting' of the Newcomen Society of the United States held in Philadelphia ... on November 7th, 1984."--P. [1]