Inside the Federal Price Administration building. On the security guard's desk on the ground floor.
Inside the mall's security office, on the floor near the desk.
Inside Joe's apartment building. On the ground floor, hidden behind the locked wooden gate under the stairs. Chapter 5: The Buzzsaw
On the bedroom floor of Eric's friend’s apartment. Mafia 2 All Playboy Pictures Download
: 4 Magazines. Located near the bar counters inside the Maltese Falcon restaurant.
: You can download community-created save files for both the Definitive Edition that have all 50 magazines already unlocked. Steam Community Image Galleries
Planetarium interior. Inside the telescope room, on the edge of the circular desk platform. Inside the Federal Price Administration building
Inside Mike Bruski’s scrapyard office, on a shelf near the door. Chapter 3: Enemy of the State (3 Magazines)
Collecting all 50 base game magazines awards players with two distinct achievements/trophies across PlayStation, Xbox, and Steam platforms:
Derek Papalardo’s office; Office of Price Administration lobby/basement. Inside Joe's apartment building
On the ground behind a grandstand in the prison yard.
For a detailed walkthrough, it is highly recommended to use a visual guide, such as the one found on GamesRadar+ (link), which provides screenshots of every exact location.