Thank you for your interest in our rare maps. Please fill out this form to be added to the waitlist for the map 1842 Wilkes Map of the World on Mercator Projection showing Isothermal Lines . We encourage telling us about your interest in this specific map, and your collecting interests in general. This information will help direct our searches, and where a map is unobtainable, enable us to recommend a comparable alternative. Please note, there are several fields, including address and telephone, which are required to let us know your interest is serious.