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| Entry |
|---|
| PG Air Filter PA5821, Jul. 11, 2018, Amazon, site visited Dec. 17, 2021: https://www.amazon.com/dp/B07FDYM17W/ (Year: 2018). |
| Baldwin Filters photo, Sep. 28, 2016, Facebook, site visited Dec. 27, 2021: https://www.facebook.com/BaldwinFilters/photos/a.358228144209910/1280441658655216/?type=3 (Year: 2016). |