| Answer | Crossword Clue |
|---|---|
| RTE | Abbr. for 1 or 81 |
| ATNO | 1 for hydrogen or 2 for helium: Abbr. |
| ATWT | 1, for hydrogen: Abbr. |
| RTE | 1, for one: Abbr. |
| ATWT | 1.008, for hydrogen (abbr.) |
| RTE | U.S. 1, for one: Abbr. |
| RPM | 33 1-3, for a record album: Abbr. |
| RPM | 33 1-3, e.g., for a record: Abbr. |
| LCD | 30, for 1-5 and 1-6, e.g.: Abbr. |
| LCD | 20, for 1-4 and 1-5, e.g.: Abbr. |
