REINO UNIDO. INDICADORES DE AVES. TENDENCIA 1970-2017

https://www.bto.org/science/monitoring/developing-bird-indicators?fbclid=IwAR0VF9-PUfvCeGyV7rFYbEQD6wLlTEGVmacpPqe-mOa-yIrjBRdQ9j3jYOs