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Filter: Subject of sanitation
| Date: | 02 22 1950 |
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| Description: | An example of a pilot plant to remove phosphorus from sewage effluent by engineering professors William L. Lea and Gerard A. Rohlich. |
| Date: | 1976 |
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| Description: | An older man is standing in an office, possibly a weigh station of the Philadelphia Street Department. He is at a bench with papers and various office supp... |
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