Humboldt's System of Isothermal Lines, Lines of Equal Annual Mean Temperature Over the Globe:...
A large thematic map derived from the great Alexander Von Humboldt. Shows the world with lines of equal barometric pressure and includes general contours for the continents and islands. Specific polar expeditions are noted from Bellinghausen and Weddell to Parry and Franklin.
Condition is good with some light soiling. Image size is approximately 19.5 x 23.25 (inches).
