Population is related to Measure. Measure is related to Gather. Gather is a synonym of Increase. Increase is a type of Amount. 
Library is related to Educational. Educational is related to Reading. Reading is related to Sight. Sight is part of Perception. 
Population <--RelatedTo--> Measure <--RelatedTo--> Gather <--Synonym--> Increase --IsA--> Amount 
Library <--RelatedTo--> Educational <--RelatedTo--> Reading <--RelatedTo--> Sight --PartOf--> Perception 