ENLAGANZ-Octavos-Pt-1-Index-Cards-0001-0100
The Octavos series of catalogue index cards describe books sized 20 to 25 cm high that are held in the LAGANZ collections.
Fun fact: Octavo, a Latin word meaning "in eighth" or "for the eighth time", is a technical term describing the format of a book, which refers to the size of leaves produced from folding a full sheet of paper on which multiple pages of text were printed to form the individual sections (or gatherings) of a book. - Wikipedia