Master Rigger's Reference Card (Pocket Size)
Five panels on each side display level and incline plane, 1/2/3/4 leg lifts, CG's, CoF, conversions, two rulers, beam loading, % grade, load turning, D/d ratios and more.
Rigger's Pocket Guide
Crosby Rigging Guide for Lifting
Bob's Rigging & Crane Handbook (Pocket Size)
Crosby Rigging Guide for Blocks