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![Isotherms showing average temperatures in Russia during selected monthsas well as a contoured map of the amplitude of change during the year wea05005.jpg Isotherms showing average temperatures in Russia during selected monthsas well as a contoured map of the amplitude of change during the year](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_wea05005.jpg?itok=a3cv3Q0U)
Description
Isotherms showing average temperatures in Russia during selected monthsas well as a contoured map of the amplitude of change during the year.Published in Petermann's Geographische Mittheilungen. (Image credit: Historical Collections of the NOAA Central Library; NOAA Central Library Historical Collections)