Librería Samer Atenea
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Librería Kolima (Madrid)
Librería Proteo (Málaga)
This book contains one year of mathleague.org Relay Challenge materials. There are a total of 40 Relay rounds, each with 15 questions and solutions.