| Key to Letters used in No. In Set Column | |
| K - Smaller than Standard | 51 x 41mm |
| M - Medium Size | 80 x 52mm |
| L - Large Size | 80 x 71mm |
| T - Typhoo/Doncella Size | 106 x 52mm |
| X - Extra Large Size | 80 x 113mm |
| P - Postcard Size | 165 x 110mm |
| G - Cabinet Size | 228 x 165mm |
| E - Too Large for Albums | |
| D - Dual (more than one) Size | |
| S - Stereoscopic Series | |
| F - Photographic Production | |