R. G. Baily: Ecosystem Geography. Berlin, Springer, 1996. xii, 204 s. ill., l kort i lomme. 24 cm. DEM 59,-. R. G. Baily: Ecoregions - the ecosystem geography of the oceans and continents. New York, Springer, 1998. ix, 176 s., ill., 2 kort i lomme. 24 cm. GBP 26,-. - Christiansen, Sofus (Geografisk Tidsskrift, 1999)