Update README.md

README.md

@@ -24,7 +24,12 @@ filtration efficiency testing is inspired by ASTM standards [F2299](https://www.
 | [Arauco BKP](./Arauco/Arauco.md) | 1 |  | <img src="./Arauco/BKP/SEM/AraucoBKP_7_20nmAu_side_0003.jpg" height="200"> |  | 8 | 0.088 |
 | [Arauco EKP](./Arauco/Arauco.md) | 1 |  | <img src="./Arauco/EKP/SEM/AraucoEKP_8_20nmAu_top_0004.jpg" height="200"> |  | 4.9 | 0.083 |
 | [Arauco UKP](./Arauco/Arauco.md) | 1 |  | <img src="./Arauco/UKP/SEM/AraucoUKP_6_20nmAu_top_0003.jpg" height="200"> |  | 6 | 0.0034 |
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+| [3M MPR 300 ]() | 1 |  | <img src="./3M_300MPR/SEM/3M_filtrete300_20nmAu_top_0004.jpg" height="200">|  |  |  |
+| [3M MPR 1000]() | 3 |  | <img src="./3M_1000MPR/SEM/3M_filtrete1000_20nmAu_top_0019_raw.jpg" height="200">|  |  |  |
+| [3M MPR 1900]() | 3 |  | <img src="./3M_1900MPR/SEM/3M_filtrete1900_20nmAu_top_0004_raw.jpg" height="200">|  |  |  |
+| [cotton tshirt]() | 1 |  | <img src="./cotton/SEM/tshirt_100cotton_20nmAu_top_0004.jpg" height="200">|  |  |  |
+| [polyester pillow case]() | 1 |  | <img src="./polyester/SEM/pillowcase_20nmAu_top_0005.jpg" height="200">|  |  |  |
+| [HEPA filter]()| 3 |  | <img src="./HEPA/SEM/inline_HEPA_20nmAu_top_0008.jpg" height="200">|  |  |  |
 
 
 ## Measurement methods