Graphics
Posters
WW1 Posters
Propaganda and Recruitment Posters
WW1 Recruitment and Propaganda Posters
Library of Congress WW1 posters
Fonts
9 World War Fonts (WW1 or 2?)
Pinterest WW1 font and design examples
WW1 Fonts discussion
1915 Typefaces
1910s Fonts
Remington typewriter fonts
Popular fonts by year
Photos
Documenting reality - War shock pics
Library of Scotland WW1 official photos
WW1 dogfight images - Google
Shooting down a balloon - Google images