Explorabook and Earthsearch loom hugely in my childhood memories; I can't think of another book that has stuck with me so much. Reminiscing with my mother now (I'm 30) about times spent eating biscotti in the Barnes & Noble cafe. Was recently trying to source a couple copies in Germany for a friend's kid. Now I'm reminded of the other titles, I'll probably get a set for myself as well :) Truly, thanks a million for bringing these into the world.