Supplementary files for 'Investigating the use of grinding tools in prehistoric Bulgaria by phytolith analysis'

Supplementary files for 'Investigating the use of grinding tools in prehistoric Bulgaria by phytolith analysis'. ESM 1. Full description of the protocol used to process archaeological samples for phytolith extraction and other files relevant to the methods. ESM 2. Phytolith datasets, including the full counting sheet, the processing weights and the dataset used for multivariate statistics. ESM 3. Description of the methods and the results of the XRF analysis of two grinding tools.