Almost 8,000 jobs in UK libraries have disappeared in six years, about a quarter of the overall total, an investigation by the BBC has revealed.
Over the same period, some 15,500 volunteers have been recruited and 343 libraries have closed, leading to fears over the future of the profession.
Children's author Alan Gibbons said the public library service faced the "greatest crisis in its history".
The government said it funded the roll-out of wi-fi to help libraries adapt.
The BBC has compiled data from 207 authorities responsible for running libraries through the Freedom of Information Act. Our analysis shows:
Some 343 libraries closed. Of those, 132 were mobile services, while 207 were based in buildings (and there were four others, such as home delivery services)
The number of closures in England is higher than the government's official estimate of 110 buildings shut
A further 111 closures are planned this year
The number of paid staff in libraries fell from 31,977 in 2010 to 24,044 now, a drop of 7,933 (25%) for the 182 libraries that provided comparable data
A further 174 libraries have been transferred to community groups, while 50 have been handed to external organisations to run. In some areas, such as Lincolnshire and Surrey, the move has led to legal challenges and protests from residents.