Humboldt's system of isothermal lines: or lines of equal annual mean temperature over the Globe
1849
Brunei, Cambodia, East Timor, Indonesia, Laos, Malaysia, Myanmar, Papua New Guinea, Philippines, Singapore, Southeast Asia, Thailand, Vietnam
A world map, including Southeast Asia, showing isothermal lines—lines that join locations of the same temperature—of annual mean temperature. There are also isobars (lines that join locations of the same barometric pressure).
