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CATEGORY: POLLUTION CONTROL
| 148 - Instruments | 149 - Standards |
| 150 - Tests |
- DELAWARE - The Del-Chem Bulletin
- DETROIT, MI - The Detroit Chemist
- MASSACHUSETTS & NEW HAMPSHIRE - The Nucleus Newsletter
- NEW YORK CITY & NORTHERN NJ - The Indicator Newsletter
- PHILADELPHIA - The Catalyst Newsletter
- PITTSBURGH - The Crucible
- SAN FRANCISCO - The Vortex Newsletter
- WASHINGTON, DC - The Capital Chemist Newsletter
