The aim of the project Virtual Deposit Library is to simplify and increase the efficiency of the preservation book collections refilling, which are stored in the Czech libraries. The main goal is to create a special application which enables(based on the harvested data from library catalogues) to evaluate the lists of discarded books, that are offered by the public libraries. To increase the value of Bohemical book collections three certified methodologies for building of preservatives collections will be also developed. The project takes into account not only the presence of the single specimens in the collections but also some attributes of their physical condition, which are continuously examined through the extensive research of book collections. All the activities funded by the Virtual Deposit Library project will enrich preservation collections greatly and support the cultural heritage stored in the Czech libraries.