Are we talking;
float glass, laminated glass, tempered glass, insulated glass? Bespoke, custom or standard?
Hardwoods, softwoods, OSB, plywoods, fibreboards (HD, MD & LD), blockboards, laminates or conti's? Pressure-treated, chemical-treated, rough-sawn, planed (2-side or 4-side), chamfered or tooled? Tongue-and-groove, tenon-and-mortise, dovetail, bolt, shoe, nail, glue-and-screw, roller bearing, dowel-joint, block-fixer, or mitre?
Rolled steel, tempered steel, high-tensile steel, pre-stessed steel, corrugated iron, wrought iron, steel plate, reinforcing steel? Bolted, riveted, spot welded, seam welded, butt welded, concreted, shrink-fitted or suspended (with or without expansion joints)
I won't start on the non-ferrous constructional metals.....
You could always start off with Wickes or B&Q websites........
Out of curiosity, what is the degree you are doing?