The Progressive reference library.
Subtitle: A new edition with extensive revisions, additions and enlargements based upon the newest census reports and the most recent epoch-making discoveries, inventions and achievements.  A library of history, geography, biography, biology, literature, economics, civics, arts, sciences, discoveries, explorations, inventions, commerce, etc. Cyclopaedia of general and recent information...
Contributors: Holst, Bernhart Paul, 1861-
Publisher: The Holst Publishing Company
Published: 1939
Place of publication: Boone, Ia; Chicago, Ill. [etc.]
Language: eng
Number of pages: 11
Subjects: Encyclopedias and dictionaries.
Notes: Vols. 1-8 and 9-10 paged continuously.
Vols. 9-10 have title: Practical home and school methods.
Vol. 11 has title: Loose leaf extension service.
On cover: With loose leaf revision service.
Editor in chief: B. P. Holst.