| Abbreviation for a quote whose source is unknown |
| Algebraic unknowns |
| Subj. with knowns and unknowns |
| Auth. unknown" byline |
| Series of unknown challenges? |
| Unknown author's byline, briefly |
| An unknown quantity |
| Prolific unknown author? |
| Previously unknown |
| Unknown auth. |
| Unknown author's byline |
| Algebra unknowns |
| Author unknown byline, briefly |
| Unknown UFO crash victim? |
| Unknowns in algebra |
| ''Auth. unknown'' |
| Author unknown" byline |
| Actress Kruger of "Unknown |
| Simultaneous equation unknowns |
| John ___ (unknowns) |
| Abbr. used when an author is unknown |
| Of unknown authorship: Abbr. |
| Course full of unknowns |
| Something unknowns are introduced in |
| Unknowns to figure out |
| Transitioned into something unknown |
| Anonymous litigant |
| Last name in anonymous litigants |
| Author's unknown byline, briefly |
| Subj. with many unknowns |