value on old world stamp album full of stamps
 

I have inherited two old collector albums full of stamps. One of them is a
Whitman album titled "Around the World Stamp Book".
Every country from about 1850 thru 1935 that produced stamps is represented,
with no empty spots. They date from 1850 thru 1935 and are hinged, unused.
Would anyone have a rough estimate of value?