The notation is as such: [Series][Volume #]#[Issue#]
So Amazing Spider-Man Volume 1 #15 would be read: ASM1#15
Series abbreviations:
Amazing Spider-Man: ASM
Astonishing Tales: AT
Black Panther: BP
Captain America: CA
Creatures on the Loose: CotL
Daredevil: DD
Ka-Zar: KZ
Ka-Zar the Savage: KZtS
Marvel Chillers: MCh
Marvel Fanfare: MFan
Marvel Graphic Novel: MGN
Marvel Team-Up: MTU
Marvels: M
Peter Parker, the Spectacular Spider-Man: PPSSM
Secret Wars: SW
Sensational Spider-Man: SSM
Spider-Man: SM
Spider-Man’s Tangled Web: SMTW
Tales of Suspense: ToS
Web of Spider-Man: WSM
Webspinners: Web
West Coast Avengers: WCA
X-Men: The Hidden Years: XMHY