9 volumes from the pre-war Library of Knowledge series. No date of publication, certainly before 1939 (this series was coming out in the 1930s)
Condition of preservation overall good, hard cloth cover, original pre-war wrapper preserved in some volumes!
Information about the series:
LIBRARY OF KNOWLEDGE - contains works of the most distinguished Polish and foreign authors in volumes with a format of 22 x 15 cm, printed on the best illustrative matte wood-free paper. Each volume is a closed whole, and the set of the Library of Knowledge covers all fields of science
