Bel Canto Studies for Trumpet, edited by John Korak. Seventy-seven studies written by 19th Century vocal teachers (Abt, Lütgen, Marchesi, Nava, Panofka, Panseron, Sieber, Tosti, Vacci).
Like the popular Complete Solfeggi of Concone (BQ-51), this book is full of music in the lyric, “flow studies” vein that is enjoyable to play and good for the trumpeter’s physical and musical well-being.
At the end of each study, John lists a group of keys to which he suggests the player transpose the piece. So it serves as a challenging door to the necessary art of transposition.
Links here provided are an additional feature of this book. These include all of the piano accompaniments for use with the Bb trumpet and C trumpet in printable PDF files. Another printable, PDF file contains all of the studies in the book written with Moving Transpositions for the trumpet. This means that one phrase may be for "Trumpet in Bb" and the next may be "Trumpet in F" etc. In the E-version of the book, for the iPad, these Moving Transposition versions of the etudes are included.
Perhaps most unique featured link is the accompaniments in SmartMusic files. This will allow you to play the studies with the computer playing the accompaniments. (You do need SmartMusic software, bundled with Finale or obtained from MakeMusic.com).
These SmartMusic files represent a marked improvement over the original files on a CD (now obsolete) that used to be bundled with the printed book.