The Eagle of the Ninth has 255 pages.
The Ninth Avatar has 374 pages.
Urban the Ninth has 192 pages.
Annals of the Twenty-Ninth Century has 758 pages.
Under the Eagle has 256 pages.
The Eagle's Prey has 480 pages.
The Eagle's Conquest has 256 pages.
A Catskill Eagle has 311 pages.
The Eagle Has Flown has 352 pages.
Once An Eagle has 1312 pages.
The Eagle of the Ninth was created in 1954.
Ninth Grade Slays is by Heather Brewton. The paperback has 278 pages. It is the second book in the series.
"The Eagle Has Landed" by Jack Higgins typically has around 400-500 pages, depending on the edition and formatting.