| Phase of history. |
| Linear printing units |
| Classic 1977 album pronounced like a continent |
| Classic cartoon character |
| Gym unit |
| Egyptian unit of capacity |
| Classic victim of hubris |
| Archer of whodunits |
| ___ Air (L.A. community) |
| Sitcom unit |
| AC output unit |
| Romanian monetary unit |
| Class for someone whose native tongue isn't widely spoken in the U.S., for short |
| A first name in whodunits |
| Spanish weight unit |
| History book chapters |
| Blocks of history |
| A Footnote to History" author's inits. |
| 1949 film classic |
| Infantry — unit of linear measure |
| They can be felt in a classroom |
| Feature of Melvil Dewey's book classification system |
| Blood classification |
| ___ system (blood classification) |
| Some friend you are," more classically |
| Roman military unit |
| Classroom basics |
| German family of munitions makers |
| A long-established history |
| Classroom lectures |