BOERE GC (1983) Boekbesprekingen: Ralph, C.J. & Scott, J.M. (eds) 1981. Estimating the numbers of terrestrial birds. LIMOSA 56 (2): 79-79.

RALPH C. J. & SCOTT J. M. (eds) 1981. Estimating the numbers of terrestrial birds (Studies in Avian Biology 6). Allan Press, Laurence (Kansas). 630 p.

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