Simply put, the Saint Edmund Campion Children's Missal from Corpus Christi Watershed is a brilliant way for youths to learn the meanings of the Extraordinary Form of the Roman Rite Mass (Traditional Latin Mass). This is a 1954  comic graphics featuring lovely spiritual reflections by Capuchin Fr. Demetrius Manousos.  I cannot express to you how inspiring this book is. 
​You could see a few of the sample pages above, but why not immediately download the entire book?  It's not only useful for children but it's easy learning for anyone interested to know the beauty of the Traditional Latin Mass.