Possible Clues:

• A couple
• Couple's piggy-back portrayed in book
• Small group on the course
• An item on the golf course?
• Couple given book about swine making comeback
• Couple found book with type of map hidden inside
• Little time taken by nameless ladies acquiring overlarge item
• Duo, Welsh, therefore shown up in book
• Couple's weighty volume about pig-raising
• Golfer and his buddy, say