Helios (encyclopedia)
Helios, more fully the Helios New Encyclopedic Dictionary (Greek: Νεώτερο Εγκυκλοπαιδικό Λεξικό Ηλίου or: Νεώτερον Εγκυκλοπαιδικόν Λεξικόν Ήλιος), is a general knowledge Greek encyclopaedia. Its publication commenced in 1945 while its second edition was completed in 1960, comprising 18 volumes.
The books, note that one is divided in two parts
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