Bibliography:
Japanese Cruisers of the Pacific War

As allocated by the Basic Design 基本計画 (Kihon Keikaku) Section of the Shipbuilding Section of the Navy Technical Department from 1900 onwards:

Vessel Types:

A: Battleships
B: Battle cruisers
C: Cruisers
E: Gunboats and kaibokan
F: Destroyers and Torpedo Boats
G: Aircraft Carriers
H: Mine-layers
I: Mine-sweepers
J: Special-service vessels
K: Submarine chasers
S: Submarines.

Numbers:

The number indicates in chronological order, each successive design made by the IJN's Design Section for that class of vessel; e.g G-18 is the 18th successive design put forth for an aircraft carrier.

Known Designations

Battleships

A-30: Kawachi
A-102: Nagato
A-127: Tosa
A-140: Initial Yamato Design (10 March 1935)
A-140F5 or F6: Final Yamato Design
A-150: So called “Super” Yamato

Battlecruisers

B-65:

Cruisers

C-33: Tenryu CL
C-37: Mogami CA
C-38: Tone CA
C-41: Agano CL
C-42: Oyodo CL
C-44: Kai-Agano CL
C-46: Ibuki CA

Aircraft Carriers

G-14: Taiho Derivative
G-15: Taiho Derivative

Destroyers

F-43: Fubuki (I) Class
F-45: Hatsuharu Class
F-55: Matsu and/or Tachibana Class, not known which ones each designation belongs to
F-55B: Matsu and/or Tachibana Class, not known which ones each designation belongs to