Encyclopedia of Conifers has 1500 pages.
Encyclopedia of Conifers was created in 2012.
Dinosaur Encyclopedia has 376 pages.
Encyclopedia Horrifica has 144 pages.
WWE Encyclopedia has 366 pages.
Encyclopedia Brunoniana has 629 pages.
The Otaku Encyclopedia has 248 pages.
Conspiracy Encyclopedia has 320 pages.
Armenian Encyclopedia has 720 pages.
Encyclopedia of Chicago has 1117 pages.
The Encyclopedia of Malaysia has 144 pages.
The ISBN of Encyclopedia of Conifers is 978-1-907057-15-1.
It isn't possible to say how many pages are in any one encyclopedia without knowing which encyclopedia, and which edition of that encyclopedia, is of interest.