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| Lab Number | Lab Name | City | State |
|---|---|---|---|
| 907201 | Palmerton & Parrish, Inc. Palmerton & Parrish, Inc. Springfield, MO Laboratory | Springfield | MO |
| 914710 | Paramount Testing Corporation Fordyce Laboratory | Fordyce | AR |
| 903100 | Paramount Testing Corporation El Dorado Laboratory | El Dorado | AR |
| 908203 | Paramount Testing Corporation Bearden Laboratory | Bearden | AR |
| 923123 | Paramount Testing Corporation Batesville Laboratory | Batesville | AR |
| 903800 | Pine Bluff Sand and Gravel Company Monticello Laboratory | Monticello | AR |
| 904700 | Pine Bluff Sand and Gravel Company Pine Bluff Laboratory | Pine Bluff | AR |
| 921921 | Premier Testing Laboratories, LLC Premier Testing Laboratory | Palmyra | MO |
| 910805 | Professional Service Industries, Inc. Memphis Regional Laboratory | Memphis | TN |
| 918017 | Professional Service Industries, Inc. Little Rock Laboratory | Sherwood | AR |