Trees, maps, and theorems
Effective communication for rational minds

We ship from our fulfillment center in Michigan
to locations within North America (96 USD/copy)
and either from there or from Brussels, Belgium
to everywhere else in the world (80 EUR/copy).
We offer bulk discounts for eight copies or more;
to order more than 20 copies, please contact us.

Tax and shipping costs depend on destination.
Select your part of the world from the list below:

>  Belgium
>  European Union [list]
>  Rest of Europe [list]
>  United States
>  Canada / Mexico
>  Rest of the world

After placing your order on this site, you will be transferred
to PayPal for payment by credit card (or from your account
if you have one). We neither see nor store this information.
If you wish to pay by direct bank transfer, please contact us.