The IOS library's catalog contains almost 660 different economic and social statistics from East and Southeast European countries. The collection focuses on Russia, Poland, Hungary and Ukraine; however, rarely obtainable statistics from Central Asia and the Caucasus are available here as well. Thus, the library features the second-most varied collection of economic and social statistics pertaining to East and Southeast Europe in Germany after the German National Library of Economics (ZBW) in Kiel. The shelving and accessibility of the statistics is very user-friendly: the current years of the most common statistics are shelved in the IOS reading room and are therefore immediately accessible. Older and more rarely demanded volumes can be ordered directly from the closed stacks for use in the reading room and are swiftly available.