Pocket Valve Big Twins 1915-1929. An Identification and Restoration Guide - Steve Slocombe
Spiral Bound Restoration Book. Bout 3/4" thick.
You definitely should have one of these on your desk.
Contents:
The Machines by Year (photo Identification)
Motor/Engine
Exhaust System
Carburetors
Transmission
Forks
Frames and siderails
Seats and seat posts
Handlebars and Controls
Tool and Battery Boxes
Tanks and lines
Mudguards/Chainguards
Wheels/Hubs and Brakes
Electrical and Ignition
Lights and horns
Sidecars
Paint