A study of air pollution in the Helena-East Helena area (Helena Valley) October 1965-October 1968.
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| Corporate author / creator: | Montana. Division of Air Pollution Control & Industrial Hygiene. |
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| Imprint: | Helena, [1969] |
| Description: | iii, 35 l. illus. 28 cm. |
| Language: | English |
| Subject: | |
| Format: | Print Book |
| URL for this record: | http://pi.lib.uchicago.edu/1001/cat/bib/3012403 |
| Physical Description: | iii, 35 l. illus. 28 cm. |
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| Bibliography: | Bibliography: leaf 35. |