id	keyword
crl-15608	library
crl-15608	libraries
crl-15608	collections
crl-15608	preservation
crl-15608	national
crl-15608	slavic
crl-15608	l’viv
crl-15608	materials
crl-15608	condition
crl-15608	research
crl-15608	bulgaria
crl-15608	ukraine
crl-15608	national library
crl-15608	years
crl-15608	building