| Divisions of history | 20 |
| Distinctive stretches | 21 |
| Diamond figures: Abbr. | 22 |
| Depression and Prohibition, for two | 35 |
| Depression and Prohibition | 26 |
| Deadball and Steroid, in baseball | 33 |
| Deadball and steroid, e.g. | 26 |
| Cy Young candidates' stats | 30 |
| Concerns for pitchers | 21 |
| Concerns for Cone and Rivera | 28 |
| Concerns for Clemens and Rivera | 31 |
| Common and Christian | 20 |
| Colonial and Modern | 19 |
| Clinton and Bush, for two | 25 |
| Climatologist's times | 25 |
| Cicero's "you were" | 33 |
| Chronology stretches | 20 |
| Chronology segments | 19 |
| Christian et al. | 16 |
| Christian and Roman | 19 |
| Christian and Paleozoic | 23 |
| Christian and Muslim periods | 28 |
| Christian and Mayan | 19 |
| Christian and gaslight | 22 |
| Christian and Elizabethan | 25 |
| Christian and Abraham | 21 |
| Chapters in world history | 25 |
| Chapters in time | 16 |
| Chapters in social studies | 26 |
| Chapters in geology | 19 |
| Chapters in a history book | 26 |
| Certain time spans | 18 |
| Certain historical spans | 24 |
| Cenozoic and Paleozoic, e.g. | 28 |
| Cenozoic and Big Band | 21 |
| Cardinal numbers? | 17 |
| Bull pen figs. | 14 |
| Box score stats | 15 |
| Blown saves often make them go up | 33 |
| Big times? | 10 |
| Big slices of history | 21 |
| Big periods | 11 |
| Big historical periods | 22 |
| Big Band and such | 17 |
| Big band and Roman, e.g. | 24 |
| Baseball stats usually rounded to two decimal places, for short | 63 |
| B.C. and A.D. | 13 |
| Augustan and Caesarean | 22 |
| Augustan and Actian | 19 |
| Archeozoic, Paleozoic, etc. | 27 |
| Archeozoic and Cenozoic | 23 |
| Amounts of time | 15 |
| Alexandrian and Napoleonic | 26 |
| Alexandrian and Babylonian | 26 |
| Alexandrian and Augustan | 24 |
| Ages in history | 16 |
| Actian and Alexandrian | 22 |
| Aces have low ones | 18 |
| "Ut ___!" (Caesar's "As you were!") | 59 |
| "-zoic" periods | 25 |
| ''-zoic'' time periods | 38 |
| Like some pens | 14 |
| Impermanent | 11 |
| Penciled-in | 11 |
| Like some typing paper | 22 |
| Like blackboards | 16 |
| Unlocked, as a computer file | 28 |
| Subject to removal | 18 |
| Subject to being wiped out | 26 |
| Not permanent, as ink | 21 |
| Like whiteboards | 16 |
| Like some wall calendars | 24 |
| Like some compact discs | 23 |
| Like slates and hard drives | 27 |
| Like CD-RW discs | 16 |
| Like a whiteboard | 17 |
| In pencil, for example | 22 |
| Easy to wipe clean | 18 |
| Easy to undo | 12 |
| Easy to get rid of, as pencil marks | 35 |
| Can be easily removed by rubbing | 32 |
| Wipe clean | 10 |
| Do in | 5 |
| Make blank | 10 |
| Show fallibility | 16 |
| Go back to square one | 21 |
| Clear the board | 15 |
| Blank tapes? | 12 |
| Clear the slate | 15 |
| Clean the slate | 15 |
| Answering machine button | 24 |
| Demagnetize, as a tape | 22 |
| Get the lead out? | 17 |
| Get the lead out | 16 |
| Wipe the slate clean | 20 |
| Clear the blackboard | 20 |
| Wipe away | 9 |
| Wipe the chalk from | 19 |
| Opposite of pencil in | 21 |
| Clear the boards | 16 |