This document provides instructions for importing references from multiple databases into Zotero and deduplicating the references. It recommends preparing files for import, naming files with database and number of results. It then explains how to import files into separate folders in Zotero, copy all references to a main folder, and select all to check the total matches the main folder. It details how to duplicate items and select fields to simplify deduplication, merging obvious duplicates first before harder ones. It provides tips for comparing references like DOIs, abstracts, titles, and item types when deduplicating.