The McGraw-Hill Encyclopedia of Science & Technology is an English-language multivolume encyclopedia, specifically focused on scientific and technical subjects, and published by McGraw-Hill Education.
[1] The most recent edition in print is the eleventh edition, copyright 2012 (ISBN 9780071778343), comprising twenty volumes.
There is also a one-volume McGraw-Hill Concise Encyclopedia of Science and Technology based on the full set.
The sixth edition was published in May 2009 in twenty volumes including the "Index" (ISBN 9780071613668).
[2] Further "Concise" editions for Chemistry or Engineering are available today.