A protest has taken place outside Calderdale Central library by campaigners who fear the council plans to demolish the building.
The building in Halifax, which houses the district archives, could be demolished under plans to relocate the library to a new site in Broad Street.
Campaigners said such a move would be "nothing short of cultural vandalism".
Calderdale Council said it was committed to keeping a library archive and was looking at a number of options.
Protesters including Halifax MP Linda Riordan distributed leaflets and gathered signatures for a petition during Saturday's demonstration.
John Hargreaves, from the Don't Bulldoze Our Library campaign group, said: "Until we have assurances that this major community facility is safe we want to demonstrate the strength of public feeling about this issue.
"This is a really valued cultural amenity. The town has suffered some major knocks this year and the last thing we want to lose is our library and our archives from this very prominent and convenient town centre site."