| Abbreviation for a quote whose source is unknown |
| Oft-quoted auth.? |
| Algebraic unknowns |
| Subj. with knowns and unknowns |
| Auth. of many snarky blog comments |
| Auth. unknown" byline |
| Series of unknown challenges? |
| Guys and Dolls" auth. |
| Unknown author's byline, briefly |
| An unknown quantity |
| Most prolific auth. |
| Prolific unknown author? |
| Previously unknown |
| Unknown auth. |
| Unknown author's byline |
| Algebra unknowns |
| Auth.'s submissions |
| Author unknown byline, briefly |
| Unknown UFO crash victim? |
| Prolific auth.? |
| Unknowns in algebra |
| ''Auth. unknown'' |
| Author unknown" byline |
| Auth. submissions |
| Actress Kruger of "Unknown |
| Simultaneous equation unknowns |
| John ___ (unknowns) |
| Auth. of many "Bartlett's" quotations |
| Abbr. used when an author is unknown |
| Auth. of many quotations |