Почему "средневековье" появляется именно в 1914-1918 годах ??? (31)

Australian soldier 1915,

A Poilu wearing a sheepskin jerkin, stands in a shelter made of sandbags. Nieuwpoort,Belgium, c 1915. -WW1 colorized photos

(no subject)

The saline deposits of California by Bailey, Gilbert Ellis; California State Mining Bureau , 1902…
(no subject)

Food for plants by Myers, William S. (William Shields), 1907 https://archive.org/details/foodforplants00myeriala/page/231/mode/1up И кого…
(no subject)

The great nitrate fields of Chile. (Reprint of an article from the monthly bulletin of the International Bureau of American…