OM System Olympus OM-1: Pocket Guide: Buttons, Dials, Settings, Modes, and Shooting Tips (Pocket Guide Series for Photographers): 25

OM System "Olympus" OM-1: Pocket Guide: Buttons, Dials, Settings, Modes, and Shooting Tips (The Pocket Guide Series for Photographers, 25)

The Complete Guide to the OM System OM-1 (B&W Edition)

Wasabi Power Battery (2-Pack) and USB-C Dual Charger for Olympus BLX-1 and Olympus OM System OM-1/ OM-1 Mark ii