| Answer | Crossword Clue |
|---|---|
| PARTI | First of a trilogy |
| PARTI | First of a trilogy? |
| PARTI | First of a trilogy, maybe |
| UNO | First album in a Green Day trilogy |
| OPIONEERS | First of literature's "prairie trilogy" |
| OPIONEERS | First book of the Great Plains trilogy |
| OPIONEERS | First novel of the Great Plains trilogy |
| OPIONEERS | First novel in Cather's "prairie trilogy" |
