You can find digital versions of the books and audio on several platforms: FOR FOREIGN STUDENTS - Book - Ocop
Each book in the series represents roughly one year of study, building a vocabulary of approximately 3,000 words by the end of Book 4. You can find digital versions of the books
Since this is a classic series, the "installation" process typically involves downloading digital files (MP3s) and organizing them on your device for easy access. 1. Locating the Files building a vocabulary of approximately 3