These maps and projects are companion pieces for our academic research publications and are driven by the belief that research should enter public domains in widely accessible formats. Hopefully, these projects are helpful to academic researchers, teachers, students, and the general public. Making these maps is expensive, timely, and outside the traditional scope of academic work.

We will not charge anyone to use our maps, but we do need resources to continue to produce them. Therefore, on most of the work, you will see the following statement:

If you use these maps in your work or teaching, we ask you to consider donating to support the development of our work: 

We know this ask is a bit direct, but the reality of budgets these days means we figure we need to ask. We hope you understand.