@book{bhlitem35120, title = {Le gerfaut = De giervalk }, volume = {10, 1920}, copyright = {NOT_IN_COPYRIGHT}, url = {https://www.biodiversitylibrary.org/item/35120}, note = {https://www.biodiversitylibrary.org/bibliography/8275}, publisher = {Bruxelles, Institut royal des sciences naturelles de Belgique, }, author = {Institut royal des sciences naturelles de Belgique.}, year = {1920}, pages = {166}, keywords = {59.82.06(49.3)|Belgium|Birds|Periodicals}, }