Possible Clues:

• 'Show Boat' author
• 'Cimarron' novelist
• Algonquin Round Table member
• "Giant" novelist
• 1925 Pulitzer Prize-winning novelist
• "Cimarron" novelist
• 83-cent stamp subject of 2002
• ''Show Boat'' author
• She replied to Noël Coward's 'You look almost like a man!' with 'And so do you'