Books remain one of humanity's most important cultural achievements to this day. Their invention was as significant as the introduction of the printing press, akin to the impact of the internet: for the first time, mass dissemination of information became possible. Education, science, research, and even entertainment were placed on a new, technically and content-wise revolutionary foundation. Books continue to change society today. The technological capabilities of mass book printing led to a radical increase in titles during the 18th and 19th centuries. However, the conditions were still very different from today: those who wrote a book back then often created a lifelong work. This is reflected in the high quality of old books. Unfortunately, books age. Paper is not made to last forever. Therefore, we have taken it upon ourselves to preserve humanity's knowledge and make old books available in the highest quality at low prices.