Dystopian/Dystopia
Disease/Virus/Bacteria/Leprosy-Hansen's Disease/Plague/Influenza
Mass graves
(1920s) European slums
Political/Politics/Nationalism/Totalitarianism/Fascism/Fascist
Dictator(s)/Authoritarian regimes (possible specific examples like Hitler, Franco, or Mussolini)
WW2
20th century (early 20th century) medicine/medical treatments/science/doctors/hospitals
1930s- architecture/design/furniture/fashion/hair
Propaganda/propagandist art
Youth culture (in the 1930s?)
Military/war/soldiers/weapons
Demographics/social class/upper class/lower class/rich/poor
Pacifist/pacifism/peace movements
Czechoslovakia/Czech
Print Periodicals (2nd floor):
If you want to look at images from the 1930's forward, old issues of periodicals may be useful to you.
History Books (2nd floor):
Since history books usually contain photographs, search the online catalog for history books relating to the era, country, or event you are researching to see images of people in the popular fashions and hairstyles of the era.
Reference Books (2nd floor):
Please see this separate guide for fashion/costume design resources: https://millikin.libguides.com/fashion
The Copyright Information Center from Cornell University has good information on Copyright Basics and a Fair Use Checklist.
Copyright and Fair Use FAQ from Stanford University's Copyright and Fair Use Center includes extensive information on copyright law, including fair use, the public domain, and academic & educational permissions.
The video below, from the Copyright Clearance Center gives a basic overview of concepts related to copyright law.