| 100% | CIA | 3 | Subj. of the 2007 book “Legacy of Ashes” |
| 60% | CIA | 3 | Subject of the 2007 book "Sabotage" |
| 59% | IRS | 3 | Subj. of the 2005 book "Many Unhappy Returns" |
| 58% | OED | 3 | Subj. of the 2003 book "The Meaning of Everything" |
| 56% | NSA | 3 | Subj. of the book "The Puzzle Palace" |
| 56% | IRS | 3 | Subj. of the book "Many Unhappy Returns" |
| 55% | CIA | 3 | Subj. of the 2005 Pulitzer-winning book "Ghost Wars" |
| 55% | IFIDIDIT | 8 | 2007 book subtitled "Confessions of the Killer" |
| 54% | NEA | 3 | Subj. of the dance scholar Sarah Wilbur’s book “Funding Bodies” |
| 53% | ROGET | 5 | Subject of the 2007 biography subtitled "The Man Who Became a Book" |
| 51% | ESP | 3 | Subj. of Terence Hines's book "Pseudoscience and the Paranormal" |
| 49% | FALLINGMAN | 10 | 2007 book by 44-Across about a survivor of the 9/11 attacks: 2 wds. |
| 48% | BLACK | 5 | "The ___ Swan: The Impact of the Highly Improbable," 2007 book by author Nassim Nicholas Taleb |
| 47% | ENRIGHT | 7 | Anne —, author of 2007 Man Booker Prize-winning novel The Gathering |
| 46% | ENRON | 5 | Subject of the 2005 book "Conspiracy of Fools" |
| 46% | AMES | 4 | Subject of the 2012 book "Circle of Treason" |
| 45% | GERIATRIX | 9 | The old man of the Asterix books |
| 45% | HOBO | 4 | The Shaggy Man of the Oz books |
| 45% | ELSA | 4 | Heroine of the Adamson book |
| 45% | USSENATE | 8 | Subj. of the 17th Amendment |
| 45% | ERA | 3 | One of the history books |
| 45% | BETSY | 5 | ___ Bobbin of the Oz books |
| 45% | BAUM | 4 | Author of the Oz books |
| 45% | GMOS | 4 | Subjects of the 2018 book "Seeds of Science," for short |
| 44% | ENRON | 5 | Subject of the 2002 book “Anatomy of Greed” |
| 44% | HMO | 3 | Subj. in the 2007 documentary "Sicko" |
| 44% | EDITIONS | 8 | Different versions of the same book |
| 44% | RFK | 3 | Subj. of the 2006 film "Bobby" |
| 44% | DST | 3 | Subj. of the Sunshine Protection Act |
| 44% | ALOU | 4 | Moises of the 2007-'08 Mets |