![[Ornithology. Drawings etc.]. Slijper, Hendrik Johannes (1922-2007) (under pseudonym Raymond Abâcheur). (A purple heron standing next to a stream).](https://stageimg.invaluable.com/housePhotos/bubbkuyper/02/781902/H3721-L388521737.jpg)
![[Ornithology. Drawings etc.]. Slijper, Hendrik Johannes (1922-2007). (Various shore and sea birds and two seals on the edge of a Wadden island).](https://stageimg.invaluable.com/housePhotos/bubbkuyper/02/781902/H3721-L388521730.jpg)
![[Ornithology. Drawings etc.]. Slijper, Hendrik Johannes (1922-2007). (Stork in a Dutch field).](https://stageimg.invaluable.com/housePhotos/bubbkuyper/02/781902/H3721-L388521729.jpg)
![[Ornithology. Drawings etc.]. Slijper, Hendrik Johannes (1922-2007). (A peregrine falcon sitting on a tree stump).](https://stageimg.invaluable.com/housePhotos/bubbkuyper/02/781902/H3721-L388521716.jpg)
![[Ornithology. Drawings etc.]. Slijper, Hendrik Johannes (1922-2007). (A hawk on a branch).](https://stageimg.invaluable.com/housePhotos/bubbkuyper/02/781902/H3721-L388521735.jpg)
![[Ornithology. Drawings etc.]. Slijper, Hendrik Johannes (1922-2007). (Cormorants on a cliff).](https://stageimg.invaluable.com/housePhotos/bubbkuyper/02/781902/H3721-L388521720.jpg)
![[Ornithology. Drawings etc.]. Slijper, Hendrik Johannes (1922-2007). (A collection of twenty-five seabirds).](https://stageimg.invaluable.com/housePhotos/bubbkuyper/02/781902/H3721-L388521736.jpg)
![[Ornithology. Drawings etc.]. Slijper, Hendrik Johannes (1922-2007). (Birds).](https://stageimg.invaluable.com/housePhotos/bubbkuyper/02/781902/H3721-L389950281.jpg)
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