Our good friend Sandra Rebok has an article in the newest Virginia Magazine of History and Biography: "Englightened Correspondents: The Transatlantic Dialogue of Thomas Jefferson and Alexander von Humboldt" (vol. 116 no. 4). Sandra is pretty much the world's expert on this topic - and I'm not just saying that because she just sent us a bag of truffles from Spain (thanks, Sandra, they were muy delicioso!). On a related note, back issues of VMHB (1893-2004) are now available online through JSTOR - folks around here were practically swooning with joy when this development was announced. Alas, we do not have online access to later issues (the link I gave above to Sandra's article is just an abstract). It is available through some EBSCO products, however, so check with your local library.