JOHN MOON

Portland author John Moon will discuss his new photo history book “City by the Sea: A Photographic History of Portland, Maine” (Elysium Press, $40). The book includes 19th century photos compared with Moon’s contemporary color photos of the same areas. 

WHEN: 11 a.m. to 1 p.m. today

WHERE: Nonesuch Books & Cards, Mill Creek Shopping Center, 50 Market St., South Portland

HOW MUCH: Free

INFO: 799-2659