Browsing is a great way to discover something new. Here are the Library of Congress call numbers to assist browsing physical books and bound magazines relevant to the 1920s.
You will also discover art deco, Bauhaus, etc. related materials in the Ns (general fine arts), NAs (architecture), NBs (sculpture), NCs (drawing), NDs (painting), and NEs (print media). It's easiest to discover items in these areas via the catalog, rather than by browsing.
E (regular and oversize)
784-805............Harding-Coolidge-Hoover Era, "The Twenties"
785-786.........Harding's Administration, 1921-August 2, 1923
791-796.........Coolidge's Administration, August 2, 1923-1929
801-805.........Hoover's Administration, 1929-1933.
806-812...........Franklin Delano Roosevelt's Administrations, 1933-April 12, 1945.
NK
1-570......................................General
600-806..................................History
1135-1149.5............................Arts and crafts movement
1160-1590..............................Decoration and ornament. Design
1648-1678..............................Religious art
1700-2195..............................Interior decoration. House decoration
2200-2750..............................Furniture
2775-2898..............................Rugs and carpets
2975-3049..............................Tapestries
3175-3296.3............................Upholstery. Drapery
3375-3496.3............................Wallpapers
3600-(9990)............................Other arts and art industries
3700-4695....................................Ceramics
4700-4890....................................Costume
5100-5440....................................Glass
5500-6060....................................Glyptic arts
6400-8459....................................Metalwork
8800-9505.5..................................Textiles
9600-9955....................................Woodwork