TY  - BOOK
TI  - A leap through the centuries
U1  - 309.158 4 LEA 
PY  - 1968///
CY  - . - Moscow
PB  - : Progress
N1  - Translation of Ot srednevekovʹi︠a︡ k vershinam sovremennogo progressa; Bibliographical footnotes
ER  -