Complete BIC Category Listing
| Gambling | WDP | x2 |
| Garden Design & Planning | VGD | x7 |
| Gardening | VG | x5 |
| Gardening: Flowers | VGPC | x1 |
| Gardening: Fruit & Vegetables | VGPF | x1 |
| Gardening: General Interest | YWHG | x2 |
| Gardening: Herbs | VGPH | x0 |
| Gardening: Plants | VGP | x1 |
| Gardening: Shrubs & Trees | VGPS | x1 |
| Gardens (Descriptions & History) | VGB | x8 |
| Gas Industries | KNBG | x1 |
| Gastroenterology | MJH | x0 |
| Gastrointestinal & Colorectal Surgery | MNG | x0 |
| Gay & Lesbian Studies | JBG | x3 |
| Gay Studies (Gay Men) | JBGM | x2 |
| Gender Studies | JBF | x5 |
| Genealogy | HBXH2 | x17 |
| Genealogy, Heraldry, Names And Honours | HBXH | x9 |
| General & Literary Fiction | FB | x115 |
| General Cookery | VBG | x44 |
