| Curiosities & Wonders | Dates |
| Curiosities & Wonders | |
| Title | Description |
| Guinness World Records | This source is created and maintained by Guinness World Records Ltd. Brief information about the company, which also publishes the book entitled The Guinness Book of Records, is available at the site. It is not clear whether the information in the book is duplicated on the site or vice versa. |
| Dates | |
| Title | Description |
| Chambers Book of Days | The University of Wisconsin-Madison has made an electronic reprint of the original edition of this reference work available. |
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All quoted material is from the respective source.