The article presents conservation-restoration procedure on the book executed at the Book and Paper Conservation Centre at the Archives of the Republic of Slovenia in the beginning of 2017. It is an apprentice book of surgeons in Maribor which, with its unique content and data on apprentices of the Maribor surgeon guild between 1776 and 1837, is considered as important cultural heritage. Because of negligent use in the past, the book was so damaged that it was no longer possible to handle it safely. Binding was damaged, while text block was severely impaired. It had 18 leaves, even though the thickness of the spine on the cover clearly suggested that there should be more leaves. Upon thorough inspection of text block, we found that a significant number of leaves was cut out of the block. Consequently, the thickness of the spine did not optimally fit the thickness of text block, since the latter »danced around« upon each handling (because of the extra space at the back) which caused further mechanical damage. The book was untied and the leaves of the text block manually restored. The existing fragments - remains of the cut-out sheets were completed with Japanese paper in size of the whole leaf and restored to the previous thickness of text block. When restoring covers, we limited ourselves to minimal procedures and thus preserved authenticity of original materials (cover made of cardboard and leather cover). The binding of text block was reconstructed on the basis of precise inventory of the original binding. After conservationrestoration procedure, we made protective enclosure from permanent/durable paper. With the procedure, we improved material condition of the book, extended its lifetime and made the content available. Because every conservation-restoration procedure changes the original to some extent (thus document loses some of its value), we followed the basic principle of restoration profession during restoration procedure - the principle of minimal intervention - and attempted to preserve as much information as possible by minimising the intervention