Send a correction

Found an error? Send it.

What happens to it

Corrections go to every buyer. They are not a paid upgrade and never will be — this book is sold on the claim that its figures are checkable, so charging you to be told that one of them was wrong would put the evidence behind a second payment.

There is no schedule. A correction ships when it is found, not on a calendar.

What makes a correction easy to act on

The book grades every source it uses, so a correction lands fastest when it carries the same things a source does:

Which figure, by page or by the id printed beside it
What it should say
Where that comes from — a publisher and a locator, not a summary of one
When it was measured, which is usually different from when it was published

A correction without a source is still worth sending. It just takes longer, because the check has to be done from scratch.

Contributions to the gap register

The gap register lists every question the book could not answer at the grade it requires. Some of those are marked closeable, which means a published source exists and nobody has compiled it.

If you know one, send it. Contributions with a source and a date go into the next edition, with credit, unless you would rather not be named.

If you cannot afford the book

Write to the same address and ask, and it is yours. No means test, no explanation needed.

$19 is a different amount of money in different places, and this book is written for readers in markets where it is real money. Asking is not a favour and it will not be treated as one.