Recopilación de observaciones sobre ecología general y anidamiento del Milano negro (Milvus migrans) realizadas durante diversas salidas de campo a diferentes enclaves de la provincia de Valladolid, entre el 19 de mayo de 1943 y agosto de 1952.
Compilation of general ecology and nesting observations of the Black Kite (Milvus migrans) obtained through many field trips to different habitats of the province of Valladolid, between the 19th of May of 1943 and August of 1952.
