The name is well-known in the brass world for his published tutors, especially amongst horn and trumpet players, but scarcely anything is known about the man himself.
Internet searching in March 2019 has turned up just a little about Alphonse Maxime [Jean Marie Maximin François Alphonse], a teacher and horn soloist. Apparently he won the Premier Prix for horn at the Paris Conservatoire and was a soloist at the Monte Carlo, Concerts Pasdeloup and Opera Comique.

Brass Sheet Music

10 Etudes Nouvelles (Horn Solo) (Horn) Ffrom "200 Etudes nouvelles" Vol.1 (No.1, No.5, No.40, No.41, No.44 and No.46) and Vol.2 (No.12, No.23, No.24 and No.27) Publisher: Alphonse Leduc et cie ( HL.48183017)

12 Etudes Nouvelles (Horn Solo) (Horn) Ffrom "200 Etudes nouvelles" Vol.1, No.3, 6, 7, 10, 36 and 37; Vol.2, No.17, 28, 29 and 37; Vol.3, No.7 and No.20 Publisher: Alphonse Leduc et cie (HL.48184273)

200 Etudes Nouvelles Volume 1 (Horn) 70 Etudes Tres Faciles et Faciles - Cor ISBN 9790046168574. Level: Very Easy Publisher: Alphonse Leduc et cie (AH.AL16857)

200 Etudes Nouvelles Volume 2 (Horn) 40 Etudes Faciles - Cor ISBN 9790046167201. Level: Easy Publisher: Alphonse Leduc et cie (AH.AL16720)

200 Etudes Nouvelles Volume 4 (Horn) 20 Etudes Difficiles - Cor ISBN 9790046163920. Level: Advanced Publisher: Alphonse Leduc et cie (AH.AL16392)

200 Etudes Nouvelles Volume 5 (Horn) 20 Etudes Tres Difficiles - Cor ISBN 9790046164064. Level: Very difficuzlt Publisher: Alphonse Leduc et cie (AH.AL16406)

200 Etudes Nouvelles Volume 6 (Horn) 10 Gdes Etudes Nouvelles Virtuosite Cor ISBN 9790046165436. Level: Advanced  ⇑Publisher: Alphonse Leduc et cie (AH.AL16543)

200 New Melodic and Gradual Studies for Horn - Book 1 (Horn) 70 Etudes Tres Faciles 28 pages. Level: Very Easy Publisher: Alphonse Leduc et cie (HL.48180239)

200 New Melodic and Gradual Studies for Horn - Book 2 (Horn) 40 Etudes Faciles 23 pages. Level: Easy Publisher: Alphonse Leduc et cie (HL.48180223)

200 New Melodic and Gradual Studies for Horn - Book 3 (Horn) 40 Etudes Moyenne Force 26 pages. Level: Medium Difficulty Publisher: Alphonse Leduc et cie (HL.48180224)

200 New Melodic and Gradual Studies for Horn - Book 4 (Horn) Vingt Etudes Difficiles Level: Difficult Publisher: Alphonse Leduc et cie (HL.48180155)

200 New Melodic and Gradual Studies for Horn - Book 5 (Horn) Vingt Etudes Tres Difficile 24 pages. Level: Very Advanced Publisher: Alphonse Leduc et cie (HL.48180159)

200 New Melodic and Progressive Studies for Horn. (Horn) 28 pages. Publisher: Alphonse Leduc et cie (HL.48180187)

30 Etudes D'apres Maxime-alphonse (Bass Trombone) 14 pages. Arr./Editor: Barton Cummings  ⇑Publisher: Alphonse Leduc et cie (HL.48183531)

Etudes Nouvelles - Volume 1 (Trumpet) 20 Etudes difficiles 19 pages. Level: Difficult Publisher: Alphonse Leduc et cie ((HL.48180198)

Etudes Nouvelles - Volume 2 (Trumpet) 20 Etudes très difficiles 23 pages. Level: Very Difficult Publisher: Alphonse Leduc et cie (HL.48180199)

Etudes Nouvelles - Volume 3 (Trumpet) 25 pages. Publisher: Alphonse Leduc et cie ((HL.48181452)