Alexandre Petit’s three volume collection entitled “Etudes et Exercices” is a classic collection of preparatory studies for trumpet players. Each method book focuses on one aspect of playing, from grand characteristic studies, to finger patterns and scales, to artistic melodic studies. Each volume is available at qPress, here are their titles and where you can find them.
Book One, Etudes et Exercices: La Semaine Du Virtuose
Book Two, Etudes et Exercices: 15 Etudes Techniques et Melodiques
Book Three, Etudes et Exercices: Grande Etudes