Blue pocket travel guide with maps

I lost my blue pocket travel guide to Western Maryland yesterday around 3pm outside the Maryland Theatre on West Washington Street, downtown Hagerstown. It's a slim paperback with a bright blue cover, a red ribbon bookmark peeking out, and a small green 'MD' sticker on the back. Inside are a few folded maps of Antietam and a pencil-drawn route, plus a coffee stain on the corner from yesterday. This book was a gift from my grandfather; it has sentimental value and I really need to get it back—if you find it, message me here and we can arrange a pickup.