Contact

9 writers cannot keep 1,769 pages perfectly current on their own. If you find something wrong, telling us is genuinely useful.

The way to reach us is [email protected]. We read every message.

• Corrections — a wrong figure, a dead product, a claim we should not have made. Handled first.
• Suggestions — something we have not covered.
• Commercial and legal — licensing, reuse, press.

You will hear back about a correction. For other mail we do our best and make no promises.

Things to take elsewhere

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