The EMSeek dataset accompanies the paper Bridging Electron Microscopy and Materials Analysis with an Autonomous Agentic Platform (Chen et al., 2025). It supports the system's reference-guided, single-click segmentation workflows and provides curated examples for downstream lattice reconstruction, property prediction, and literature-grounded reasoning. The collection spans atomic-resolution and nanoscale transmission electron microscopy… See the full description on the dataset page: https://huggingface.co/datasets/gary23ai/EMSeek.