| Fair hirer (abbr.) | 18 |
| Classified ltrs. | 16 |
| Abbr. in classifieds | 20 |
| "We're hiring" letters | 36 |
| "Help Wanted" ad abbr. | 32 |
| "All applicants welcome" | 34 |
| "All applicants welcome!" letters | 43 |
| Dog-sized creature thought to be the horse's earliest ancestor | 66 |
| Ancestor of the modern horse | 28 |
| Ancient stone | 13 |
| Stone Age stone | 15 |
| Stone artifact | 14 |
| Prehistoric stone tool | 22 |
| Naturally occurring chipped stone | 33 |
| Natural chipped flint | 21 |
| Flint tool | 10 |
| Early stone tool | 16 |
| Crudely chipped flint | 21 |
| Crude Tertiary stone | 20 |
| Crude stone artifact | 20 |
| Chipped stone | 13 |
| Cave man's tool | 19 |
| Ancient stone once thought to be man-made but now believed to have been produced by glaciation | 94 |
| Ancient flint | 13 |
| Slice of history | 16 |
| 1,000,000,000 years | 19 |
| Geological span | 15 |
| Period in history | 17 |
| Unit of Time | 12 |
| Time span | 9 |
| A dog's age | 15 |
| One billion years, in geology | 29 |
| Time division | 13 |
| Supernatural being | 18 |
| Millions of years | 17 |
| Geologic time period | 20 |
| A million millennia | 19 |
| Many eras | 9 |
| Geological stretch | 18 |
| Billion-year stretch | 20 |
| Stretch of history | 18 |
| Countless ages | 14 |
| Period of many years | 20 |
| One billion years, in astronomy | 31 |
| Longest time span, geologically | 31 |
| History unit | 12 |
| Dog's age | 13 |
| Centuries and centuries | 23 |
| Untold millennia | 16 |
| Tons of time | 12 |
| Longest time | 12 |
| Long time, geologically | 23 |
| Long time to wait | 17 |
| Long geological stretch | 23 |
| Long long time | 15 |
| Incredibly long time | 20 |
| Immeasurable period | 19 |
| A billion years, in astronomy | 29 |
| Span of epoch proportions? | 26 |
| Mind-boggling time span | 23 |
| Many, many eras | 15 |
| Longest division of geologic time | 33 |
| Long time span | 14 |
| Lengthy time | 12 |
| Largest geologic time division | 30 |
| Kind of period | 14 |
| Just about forever | 18 |
| It goes on and on | 17 |
| Geologic time division | 22 |
| Geologic time | 13 |
| Geologic span | 13 |
| Extremely long unit of time | 27 |
| Years upon years | 16 |
| Waiting period, seemingly | 25 |
| Real long spell | 15 |
| One billion years, geologically | 31 |
| Myriad moons | 12 |
| Mind-boggling time | 18 |
| Many centuries | 14 |
| Looooong time | 13 |
| Long, long ago | 14 |
| Long geologic time division | 27 |
| Lo-o-ong time | 13 |
| It's longer than an era | 27 |
| Indefinable time period | 23 |
| Humongous span | 14 |
| Gigayear | 8 |
| Geological duration | 19 |
| Geological division | 19 |
| Endless time | 12 |
| DMV wait time, seemingly | 24 |
| Division of geological time | 27 |
| Division of geologic time | 25 |
| Astronomical time period | 24 |
| Astronomer's time period | 28 |
| A bazillion jillion years | 25 |
| Years and years on end | 22 |
| Waiting period, it sometimes seems | 34 |
| Very long period | 16 |
| Vast time unit | 14 |