American Business Seminars set of 6 cassette tape recordings. New unopened old stock. Plastic has some discoloration.   Looks like workbooks are included.  See photos for actual condition. Tapes include Foreign Languages,  Remembering Music, Making Money with Memory,  Memory Aerobics,  Overcoming Absentmindedness and For Students of All Ages. Dated 1990. 

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Photos are an important part of the description.

Deadstock

NIP

NOS