Lot of 5 Og Mandino motivational books 
Format: paperback

A Treasury of Success Unlimited (1966)

The Gift of Acabar (1978)

Mission Success! (1986)

The Return of the Ragpicker (1992)

The Spellbinder's Gift (1995)

~~improve sales, improve performance, improve income, improve attitude/outlook, improve family life--these books are the key