US History Encyclopedia vs J. J. Keller® ERG App

This app provides an offline version of Encyclopedia of United States History. The Encyclopedia chronicles all the essential facts of United States history, from government and politics to science, thought and culture. Basic features include: ■ Encyclopedia - Over 17581 entries ■ Featured entries - Learn 5 entries daily with Featured entries ■ Custom List - Create a custom list - Add related entries into a same list ■ Other features: - Search for an entry using your voice - Search feature - Bookmark an entry - Easy navigation ■ If you want to suggest a new feature or report a bug, please send feedback to us. Thank you!

The Emergency Response Guide (ERG) App provides fast access to the PHMSA Emergency Response Guidebook, supporting the initial response to hazardous materials and dangerous goods transportation incidents. Built and maintained by J. J. Keller & Associates, Inc., a trusted provider of safety and regulatory compliance solutions, the app is based on the latest published edition of the ERG and designed for speed and clarity when time matters most. Users can browse the full guidebook in a mobile‑optimized format, navigate indexed and color‑coded sections, search by UN number or material name to quickly locate response guidance, and save bookmarks for quick access to frequently referenced pages. Visual identification tools support material recognition using hazmat placards, road trailer visuals, and rail car references. The app is available in English, Canadian French, and Spanish and works fully offline, making it reliable in emergency scenes and low‑connectivity environments. Designed for field use, the ERG App supports light and dark mode for readability in all conditions and serves as a trusted reference for first responders, transportation professionals, and safety personnel.