“This book will be invaluable to whoever is interested in the algebraic structures afforded by the description of global objects through local charts, the history of the surrounding ideas, and the sources. Justifying its title, it focusses on Wagner's contributions to the theory of heaps and their generalisations … . As a consequence, even readers who are not interested primarily in Wagner or heaps will find rewards for their time spent with this book.” (Markus Szymik, Mathematical Reviews, July, 2018)“This book presents the in the West little-known work of the Russian differential geometer Wagner … . the book is easy to read and should be of interest to mathematicians and PhD students interested in differential geometry and contemporary theories of physics.” (Jaak Henno, zbMATH 1403.20001, 2019)