The Library of the Academy of Sciences of the Czech Republic (ASL) manages a significant collection of books on aeronautics. The collection was assembled by the collector Eduard Langer more than a hundred years ago. Its part kept in the ASL consists of 67 printed books in 61 volumes. These are rarely preserved books from the 18th and 19th centuries in Italian, French, English, German and Latin. No other such extensive collection on this topic has been found in domestic libraries, and, although it is only a part of Langer’s original collection, it bears comparison even with collections of world-famous institutions. The text presents this remarkable collection in terms of provenance, authors and genres and is complemented by a list of printed books. and Andrea Jelínková.