The Bellanca monoplane R-46 was a model CH Pacemaker c/n 107 carrying the name "Aconquija".

Самолёты на фотографии: Aircrafts on the photo: Bellanca Pacemaker / Skyrocket - СШАUSA - 1928

R-43 was noted in the register as a Waco "Sport" but is believed to be either a Waco 10 of a Waco ASO.

Самолёты на фотографии: Aircrafts on the photo: WACO 10 / O Series - СШАUSA - 1927

R-48 was a Lockheed Vega, possibly c/n 17.

Самолёты на фотографии: Aircrafts on the photo: Lockheed Vega - СШАUSA - 1927

R-47 was reported as a Fiat Monoplane, from its appearance it is almost certainly a Fiat AS.2.

Самолёты на фотографии: Aircrafts on the photo: FIAT AS.1 / AS.2 / TR.1 - ИталияItaly - 1928

R-44 was a Ryan Monoplane.

Самолёты на фотографии: Aircrafts on the photo: Ryan B-1 Brougham - СШАUSA - 1927

Something of a rarity, R-56 was listed as a Paolini Sy or 5y, No.1. It may be a Sfreddo y Paolini P#1 which was known as "El Nacional".

Самолёты на фотографии: Aircrafts on the photo: Sfreddo y Paolini SyP I - АргентинаArgentina - 1930