After the university was taken over by the Operational Group of the Ministry of Education and the election of the University of Technology authorities, three people were employed to open the Central Library (from 1950 the Main Library). Due to the destruction of the central part of the Main Building, a three-person team functioned on the ground floor of the side wing of the building in two rooms and a hall, where on 66 m2 there was a storage, an office, a reading room and a lending library, and books were also placed on the floor.
The first works consisted of reclaiming, securing, sorting and inventorying the surviving book collection. Resources hidden in Świncz were brought in, items were also obtained from German manor libraries, monasteries (Starogard Gdański, Bydgoszcz, Kartuzy), the book collection from the construction and mechanical school in Zgorzelec and donations from, among others, former professors and employees of the University of Technology. Only 126 items remained from the book collection of the Natural History Society in Gdańsk. The inventory performed in 1946 showed 26,000 volumes, after the selection in 1948, 9,600 volumes consistent with the Library's profile were retained (the rest were transferred to other libraries).
Catalogues were created: substantive, subject-specific and alphabetical, special, departmental for mathematics, architecture, physics, and a handy catalogue in the reading room. A central catalogue of the collections of departments of individual faculties was also prepared. Due to the nature of the collection, in 1950 a new subject catalogue was introduced (by decision of the Library Committee of the Senate of the University of Technology), prepared by the director of the Library. It replaced the catalogue based on the Universal Decimal Classification used in other libraries.
Reconstruction activities were also undertaken of the destroyed part of the Main Building, which housed the Library: Jerzy Winnicki, Eng. Arch. designed the new reading room, lending room and catalogues. Construction works were completed in 1950 under the supervision of prof. Witold Minkiewicz: the size of the library was increased, the layout of the hall, corridors and rooms was changed.
