Pocket Ref 4th Edition

Pocket Ref 4th Edition. The concise all-purpose pocket-sized reference book featuring abundant information on many subjects, hundreds of tables, maps, formulas, constants and conversions. If you need to know it, it is in this book!
Over 96 new pages and thousands of updates!
Index for information access.
This book has been in print since 1989 and is now in its 4th Edition.
It has also gone through numerous printings in each edition to bring you the best!