Mathematical Gems II
Ross Honsberger
MongoDB and Mongoose Cheat Sheet
Azat Mardan
Wales and the Crusades, C.1095-1291
Kathryn Hurlock
Measure Theory
Paul R. Halmos
Breviary of the Gnostic Church of L. V. X
Paul Joseph Rovelli
Cunningham's Encyclopedia of Wicca in the Kitchen
Scott Cunningham