The most extensive and best organized pellet gun information anywhere. The exhaustive and comprehensive information comes from timeless sources the author found. The most current information about airguns is organized in a useful way .......... Contributions come from countless sources, numerous books about hunting, airguns, firearms, physics, pneumatics, ballistics and thermodynamics. They were reviewed for terminology, definitions and the current, correct information .......... This is one in a series of books about pellet guns beginning with The Airgun Dictionary (Amazon 2014) and the Airgun Reference Book Series: Airgun Reference Book I: Pellet Guns (Book I), Sights & Scopes (Book II), Pellet Ballistics (Book III), Marksmanship, Hunting & Competitions (Book IV), Tuning & Accurizing (Book V), Airgun Dictionary 2019 and the two volume Airgun Encyclopedia ........... Volume One contains Book I: Pellet Guns and Book II: Sights & Scopes and Book III: Pellet Ballistics. Volume Two contains Book IV: Marksmanship, Hunting & Competition, Book V: Tuning & Accurizing and Appendix .......... The Appendices are a critical part of understanding the use of the airgun books. Appendix B of the encyclopedia is more than just a glossary of terms. It is the entire, unabridged edition of Airgun Dictionary 2019. Still without illustrations, the new dictionary has many additions and a few corrections of the 2014 edition .......... This series and encyclopedia are bound to be airgun collector's items. The author has been a professional curriculum developer for various institutions over a 30 year period. Also, from 1999 to 2009, the author was a recreational firearms shooter, Federal Firearm Licensed dealer and did gunsmithing as well. In 2010, he turned his interests to airguns .......... This is the most complete work available on the subject. There are no photos or illustrations to take up page space and there are many pages of timeless information .......... Great reference material with more information than can be found in any one source.