The Boxcar Children Lot of 8 Paperback Books #2,3,5,11-15 by Gertrude Chandler Warner

• Surprise Island #2
  
• The Yellow House Mystery #3
• Mike's Mystery #5
• Caboose Mystery #11
• Houseboat Mystery #12
• Snowbound Mystery #13
• Tree House Mystery #14
• Bicycle Mystery #15