Willis PM 10-2.5 Precision Results, pdf has summary table and SEM images
Precision data from the SEM and SEM images from the samples. 

This dataset is associated with the following publication:
Peters, T., E. Sawvel, R. Willis, R. West, and G. Casuccio. Performance of Passive Samplers Analyzed by Computer Controlled Scanning Electron Microscopy to Measure PM10-2.5.   ATMOSPHERIC …