Salida de campo por Valladolid el 15 de octubre de 1955, de la que se anotaron observaciones sobre las siguientes aves: Otis tarda (Avutarda común) y Pterocles orientalis (Ganga ortega), de las que se incluyen los contenidos estomacales.
Field trip through Valladolid the 15th of October of 1955, of which there were noted observations about the following birds: Otis tarda (Great Bustard) and Pterocles orientalis (Black-bellied Sandgrouse), of which the stomach contents analysis is included.
