| Precambrian and others | 22 |
| Postwar period and others | 25 |
| Post-Civil War Reconstruction and others | 40 |
| Pitching stats. | 15 |
| Pitching stats for Johnson and Schilling | 40 |
| Pitching numbers | 16 |
| Pitching coaches' concerns (Abbr.) | 38 |
| Pitchers' statistics: Abbr. | 31 |
| Pitchers stats | 14 |
| Pitcher stats | 13 |
| Persian and Roman | 17 |
| Periods worth remembering | 25 |
| Periods of importance | 21 |
| Periods of history on a timeline | 32 |
| Periods of distinction | 22 |
| Periods for geologists | 22 |
| Periods divide them | 19 |
| Parts of timelines | 18 |
| Paleozoic, etc. | 15 |
| Paleozoic and Mesozoic, for two | 31 |
| Paleozoic amd Mesozoic | 22 |
| Paleontology periods | 20 |
| Oft-named time periods | 22 |
| Numbers for closers | 19 |
| Noteworthy stretches of time | 28 |
| Noteworthy periods of time | 26 |
| Noted times | 11 |
| Notable timespans | 17 |
| Notable stretches | 17 |
| Notable spans | 13 |
| Napoleonic and depression | 25 |
| Named times | 11 |
| Mundane and Vulgar | 18 |
| Mundane and Mayan | 17 |
| Mohammedan and Christian, e.g. | 30 |
| Mesozoic, et al. | 16 |
| Mesozoic and others | 19 |
| Memorable spans of time | 23 |
| Memorable spans | 15 |
| Memorable periods of time | 25 |
| Memorable periods of history | 28 |
| Memorable periods in world history | 34 |
| Measurements of control and arm strength | 40 |
| Meaningful times | 16 |
| Meaningful stretches of history | 31 |
| Meaningful stretches | 20 |
| Many presidential periods | 25 |
| Macedonian and Mohammedan | 25 |
| Macedonian and Mayan, e.g. | 26 |
| Lynn Nolan Ryan's annual stats | 34 |
| Long lines on a timeline | 24 |
| Lengthy reigns, say | 19 |
| Lasting periods | 15 |
| Key times in history | 20 |
| Key periods | 11 |
| Julian and Sidonian | 19 |
| Jazz and swing periods | 22 |
| It was, to Cicero | 17 |
| Interesting historical periods | 30 |
| Important stretches of time | 27 |
| Important stretches | 19 |
| Important historical periods | 28 |
| Important decades | 17 |
| Important dates | 15 |
| Important considerations in Cy Young Award voting | 49 |
| Hurlers' stats | 18 |
| History-book chapters | 21 |
| History topics | 14 |
| History stretches | 17 |
| History sections | 16 |
| History periods? | 16 |
| History book sections, say | 26 |
| Historical succession | 21 |
| Historical episodes | 19 |
| Historic periods of note | 24 |
| Historic chapters | 17 |
| Historic blocks of time | 23 |
| Historic blocks | 15 |
| Historians' subjects | 24 |
| Historians' study | 21 |
| Greek and Roman, e.g. | 21 |
| Good Feeling et al. | 19 |
| Golden and Reconstruction, e.g. | 31 |
| Geologists record five of these | 31 |
| Geological stretches | 20 |
| Geological epochs | 17 |
| Geological periods | 19 |
| Geologic succession | 19 |
| Gay 90's and Roaring 20's | 33 |
| Gaslight and others | 19 |
| Federalist and Imperialist, for two | 35 |
| Fashion periods | 15 |
| Eventful stretches | 18 |
| Eram, ___, erat | 15 |
| Eon subdivisions | 16 |
| Eon constituents | 16 |
| Emperor's reigns, e.g. | 26 |
| Elizabethan and Victorian, for two | 34 |
| Edwardian and gaslight | 22 |
| Divisions of time | 17 |