| Uniform title | Secret worth knowing having been solved by the Labourers' Friends' Society, is respectfully addressed to Her Most Gracious Majesty, the Queen, patroness. |
| General note | Caption title: Extract from that amusing publication "The clock-maker," in the Mark Lane express of January 21st, 1839. |
| General note | Previously published as: A secret worth knowing having been solved by the Labourers' Friends' Society ... |
| General note | "March, 1839." |
| General note | Reproduction of original from Goldsmiths' Library, University of London. |
| General note | Goldsmiths'-Kress no. 30851. |
| Reproduction note | Electronic reproduction. Farmington Hills, Mich. : Thomson Gale, 2005. Available via the World Wide Web. Access limited to licensing agreements. |
