The exhibition is called "Leningrad silhouettes." to the same calendar from 1962 to 2003. The exhibition exhibited 628 calendars. You can see right here :
https://calendarik.by/siluetyi-leningrada
In the collection you can see the calendars from both sides in Category "Fine arts" section "of the City, monuments, architecture" right here :
https://calendarik.by/kollekcziya/
An exchange you can check the "Exchange Fund" right here :
https://calendarik.by/obmennyij-fond/
Pleasant viewing !